Update meson and cmake config to only include openrtx and platform paths.
Update files to use <..> for system and external libraries, ".." for
project files and new relative paths as necessary.
Did not attempt to fix areas where includes that should be <..> were
previously ".."
Inspired by #96, closes#359.
Acked-by: Silvano Seva <silseva@fastwebnet.it>
Updated isNumberPressed() to make it not return anymore true if star or hash keys are pressed. Check
for character input, star and hash keys included, is now done by the input_isCharPressed function.
This separation also now prevents from entering non numeric characters during VFO frequency input.