Update Doxyfile for Doxygen version 1.8.18

Also made a few settings changes

extras/Doxyfile

@@ -1,17 +1,4 @@
-# Doxyfile 1.8.11
-
-# This file describes the settings to be used by the documentation system
-# doxygen (www.doxygen.org) for a project.
-#
-# All text after a double hash (##) is considered a comment and is placed in
-# front of the TAG it is preceding.
-#
-# All text after a single hash (#) is considered a comment and will be ignored.
-# The format is:
-# TAG = value [value, ...]
-# For lists, items can also be appended using:
-# TAG += value [value, ...]
-# Values that contain spaces should be placed between quotes (\" \").
+# Doxyfile 1.8.18
 
 #---------------------------------------------------------------------------
 # Project related configuration options
@@ -21,39 +8,43 @@ PROJECT_NAME           = "Arduboy2 Library"
 PROJECT_NUMBER         =
 PROJECT_BRIEF          =
 PROJECT_LOGO           =
-OUTPUT_DIRECTORY       = ./doxygen
+OUTPUT_DIRECTORY       = doxygen
 CREATE_SUBDIRS         = NO
 ALLOW_UNICODE_NAMES    = NO
 OUTPUT_LANGUAGE        = English
+OUTPUT_TEXT_DIRECTION  = None
 BRIEF_MEMBER_DESC      = YES
 REPEAT_BRIEF           = YES
 ABBREVIATE_BRIEF       =
 ALWAYS_DETAILED_SEC    = NO
 INLINE_INHERITED_MEMB  = YES
 FULL_PATH_NAMES        = YES
-STRIP_FROM_PATH        =
+STRIP_FROM_PATH        = src
 STRIP_FROM_INC_PATH    =
 SHORT_NAMES            = NO
 JAVADOC_AUTOBRIEF      = NO
+JAVADOC_BANNER         = NO
 QT_AUTOBRIEF           = NO
 MULTILINE_CPP_IS_BRIEF = NO
 INHERIT_DOCS           = YES
 SEPARATE_MEMBER_PAGES  = NO
 TAB_SIZE               = 2
 ALIASES                =
-TCL_SUBST              =
 OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
 OPTIMIZE_OUTPUT_VHDL   = NO
-EXTENSION_MAPPING      = ino=C++
+OPTIMIZE_OUTPUT_SLICE  = NO
+EXTENSION_MAPPING      =
 MARKDOWN_SUPPORT       = YES
+TOC_INCLUDE_HEADINGS   = 5
 AUTOLINK_SUPPORT       = YES
 BUILTIN_STL_SUPPORT    = NO
 CPP_CLI_SUPPORT        = NO
 SIP_SUPPORT            = NO
 IDL_PROPERTY_SUPPORT   = YES
 DISTRIBUTE_GROUP_DOC   = NO
+GROUP_NESTED_COMPOUNDS = NO
 SUBGROUPING            = YES
 INLINE_GROUPED_CLASSES = NO
 INLINE_SIMPLE_STRUCTS  = NO
@@ -64,14 +55,15 @@ LOOKUP_CACHE_SIZE      = 0
 #---------------------------------------------------------------------------
 EXTRACT_ALL            = NO
 EXTRACT_PRIVATE        = NO
+EXTRACT_PRIV_VIRTUAL   = NO
 EXTRACT_PACKAGE        = NO
-EXTRACT_STATIC         = NO
+EXTRACT_STATIC         = YES
 EXTRACT_LOCAL_CLASSES  = NO
 EXTRACT_LOCAL_METHODS  = NO
 EXTRACT_ANON_NSPACES   = NO
 HIDE_UNDOC_MEMBERS     = YES
 HIDE_UNDOC_CLASSES     = YES
-HIDE_FRIEND_COMPOUNDS  = NO
+HIDE_FRIEND_COMPOUNDS  = YES
 HIDE_IN_BODY_DOCS      = NO
 INTERNAL_DOCS          = NO
 CASE_SENSE_NAMES       = YES
@@ -107,14 +99,18 @@ WARNINGS               = YES
 WARN_IF_UNDOCUMENTED   = YES
 WARN_IF_DOC_ERROR      = YES
 WARN_NO_PARAMDOC       = YES
+WARN_AS_ERROR          = YES
 WARN_FORMAT            = "$file:$line: $text"
 WARN_LOGFILE           =
 #---------------------------------------------------------------------------
 # Configuration options related to the input files
 #---------------------------------------------------------------------------
-INPUT                  = ./src ./README.md ./LICENSE.txt
+INPUT                  = src \
+                         README.md \
+                         LICENSE.txt
 INPUT_ENCODING         = UTF-8
-FILE_PATTERNS          = *.c *.cc *.cxx *.cpp *.c++ *.h *.hh *.hxx *.hpp *.h++
+FILE_PATTERNS          = *.cpp \
+                         *.h
 RECURSIVE              = NO
 EXCLUDE                =
 EXCLUDE_SYMLINKS       = NO
@@ -128,7 +124,7 @@ INPUT_FILTER           =
 FILTER_PATTERNS        =
 FILTER_SOURCE_FILES    = NO
 FILTER_SOURCE_PATTERNS =
-USE_MDFILE_AS_MAINPAGE = ./README.md
+USE_MDFILE_AS_MAINPAGE = README.md
 #---------------------------------------------------------------------------
 # Configuration options related to source browsing
 #---------------------------------------------------------------------------
@@ -143,10 +139,11 @@ USE_HTAGS              = NO
 VERBATIM_HEADERS       = YES
 CLANG_ASSISTED_PARSING = NO
 CLANG_OPTIONS          =
+CLANG_DATABASE_PATH    =
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
-ALPHABETICAL_INDEX     = YES
+ALPHABETICAL_INDEX     = NO
 COLS_IN_ALPHA_INDEX    = 5
 IGNORE_PREFIX          =
 #---------------------------------------------------------------------------
@@ -164,6 +161,7 @@ HTML_COLORSTYLE_HUE    = 245
 HTML_COLORSTYLE_SAT    = 90
 HTML_COLORSTYLE_GAMMA  = 95
 HTML_TIMESTAMP         = YES
+HTML_DYNAMIC_MENUS     = NO
 HTML_DYNAMIC_SECTIONS  = YES
 HTML_INDEX_NUM_ENTRIES = 100
 GENERATE_DOCSET        = NO
@@ -193,11 +191,13 @@ GENERATE_TREEVIEW      = YES
 ENUM_VALUES_PER_LINE   = 4
 TREEVIEW_WIDTH         = 250
 EXT_LINKS_IN_WINDOW    = NO
+HTML_FORMULA_FORMAT    = png
 FORMULA_FONTSIZE       = 10
 FORMULA_TRANSPARENT    = YES
+FORMULA_MACROFILE      =
 USE_MATHJAX            = NO
 MATHJAX_FORMAT         = HTML-CSS
-MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+MATHJAX_RELPATH        = https://cdn.jsdelivr.net/npm/mathjax@2
 MATHJAX_EXTENSIONS     =
 MATHJAX_CODEFILE       =
 SEARCHENGINE           = YES
@@ -212,8 +212,9 @@ EXTRA_SEARCH_MAPPINGS  =
 #---------------------------------------------------------------------------
 GENERATE_LATEX         = YES
 LATEX_OUTPUT           = latex
-LATEX_CMD_NAME         = latex
+LATEX_CMD_NAME         =
 MAKEINDEX_CMD_NAME     = makeindex
+LATEX_MAKEINDEX_CMD    = makeindex
 COMPACT_LATEX          = NO
 PAPER_TYPE             = a4
 EXTRA_PACKAGES         =
@@ -227,6 +228,8 @@ LATEX_BATCHMODE        = NO
 LATEX_HIDE_INDICES     = NO
 LATEX_SOURCE_CODE      = NO
 LATEX_BIB_STYLE        = plain
+LATEX_TIMESTAMP        = YES
+LATEX_EMOJI_DIRECTORY  =
 #---------------------------------------------------------------------------
 # Configuration options related to the RTF output
 #---------------------------------------------------------------------------
@@ -251,6 +254,7 @@ MAN_LINKS              = NO
 GENERATE_XML           = NO
 XML_OUTPUT             = xml
 XML_PROGRAMLISTING     = YES
+XML_NS_MEMB_FILE_SCOPE = NO
 #---------------------------------------------------------------------------
 # Configuration options related to the DOCBOOK output
 #---------------------------------------------------------------------------
@@ -288,12 +292,10 @@ GENERATE_TAGFILE       =
 ALLEXTERNALS           = NO
 EXTERNAL_GROUPS        = YES
 EXTERNAL_PAGES         = YES
-PERL_PATH              = /usr/bin/perl
 #---------------------------------------------------------------------------
 # Configuration options related to the dot tool
 #---------------------------------------------------------------------------
 CLASS_DIAGRAMS         = YES
-MSCGEN_PATH            =
 DIA_PATH               =
 HIDE_UNDOC_RELATIONS   = YES
 HAVE_DOT               = YES
@@ -304,7 +306,7 @@ DOT_FONTPATH           =
 CLASS_GRAPH            = YES
 COLLABORATION_GRAPH    = YES
 GROUP_GRAPHS           = YES
-UML_LOOK               = YES
+UML_LOOK               = NO
 UML_LIMIT_NUM_FIELDS   = 10
 TEMPLATE_RELATIONS     = NO
 INCLUDE_GRAPH          = YES
@@ -320,6 +322,7 @@ DOTFILE_DIRS           =
 MSCFILE_DIRS           =
 DIAFILE_DIRS           =
 PLANTUML_JAR_PATH      =
+PLANTUML_CFG_FILE      =
 PLANTUML_INCLUDE_PATH  =
 DOT_GRAPH_MAX_NODES    = 50
 MAX_DOT_GRAPH_DEPTH    = 0