Drop the V1 plugin API compatibility code

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/Kaleidoscope/FingerPainter.cpp

@@ -108,20 +108,6 @@ bool FingerPainter::focusHook(const char *command) {
   return true;
 }
 
-// Legacy V1 API
-#if KALEIDOSCOPE_ENABLE_V1_PLUGIN_API
-void FingerPainter::begin() {
-  Kaleidoscope.useEventHandlerHook(legacyEventHandler);
-}
-
-Key FingerPainter::legacyEventHandler(Key mapped_key, byte row, byte col, uint8_t key_state) {
-  EventHandlerResult r = ::FingerPainter.onKeyswitchEvent(mapped_key, row, col, key_state);
-  if (r == EventHandlerResult::OK)
-    return mapped_key;
-  return Key_NoKey;
-}
-#endif
-
 }
 
 kaleidoscope::FingerPainter FingerPainter;

src/Kaleidoscope/FingerPainter.h

@@ -35,11 +35,6 @@ class FingerPainter : public LEDMode {
   void update(void) final;
   void refreshAt(byte row, byte col) final;
 
-#if KALEIDOSCOPE_ENABLE_V1_PLUGIN_API
-  void begin();
-  static Key legacyEventHandler(Key mapped_key, byte row, byte col, uint8_t key_state);
-#endif
-
  private:
   static uint16_t color_base_;
   static bool edit_mode_;