Remove start(), clearDisplay(), getInput()

These functions were previously deprecated and renamed to
begin(), clear(), buttonsState()

src/Arduboy2.cpp

@@ -19,11 +19,6 @@ Arduboy2Base::Arduboy2Base()
   // lastFrameDurationMs
 }
 
-void Arduboy2Base::start() // deprecated
-{
-  begin();
-}
-
 // functions called here should be public so users can create their
 // own init functions if they need different behavior than `begin`
 // provides by default
@@ -200,11 +195,6 @@ uint16_t Arduboy2Base::rawADC(uint8_t adc_bits)
 
 /* Graphics */
 
-void Arduboy2Base::clearDisplay() // deprecated
-{
-  clear();
-}
-
 void Arduboy2Base::clear()
 {
   fillScreen(BLACK);

src/Arduboy2.h

@@ -70,7 +70,6 @@ public:
    * call "audio.begin()".
    */
   void begin();
-  void start() __attribute__((deprecated, warning("use begin() instead")));
 
   /// Flashlight mode
   /**
@@ -98,7 +97,6 @@ public:
 
   /// Clears display.
   void clear();
-  void clearDisplay() __attribute__((deprecated, warning("use clear() instead")));
 
   /// Copies the contents of the screen buffer to the screen.
   /**

src/core/core.cpp

@@ -327,12 +327,6 @@ void ArduboyCore::setRGBled(uint8_t red, uint8_t green, uint8_t blue)
 
 /* Buttons */
 
-uint8_t ArduboyCore::getInput()
-{
-  return buttonsState();
-}
-
-
 uint8_t ArduboyCore::buttonsState()
 {
   uint8_t buttons;

src/core/core.h

@@ -183,7 +183,6 @@ public:
      * LEFT_BUTTON, A_BUTTON, UP_BUTTON, etc.
      */
 
-    uint8_t static getInput() __attribute__((deprecated, warning("use buttonsState() instead")));
     uint8_t static buttonsState();
 
     // paints 8 pixels (vertically) from a single byte