Drop the V1 plugin API compatibility code

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

src/Kaleidoscope/Cycle.cpp

@@ -81,20 +81,6 @@ EventHandlerResult Cycle::onKeyswitchEvent(Key &mapped_key, byte row, byte col,
   return EventHandlerResult::EVENT_CONSUMED;
 }
 
-#if KALEIDOSCOPE_ENABLE_V1_PLUGIN_API
-// Deprecated v1 API
-void Cycle::begin() {
-  Kaleidoscope.useEventHandlerHook(legacyEventHandler);
-}
-
-Key Cycle::legacyEventHandler(Key mapped_key, byte row, byte col, uint8_t key_state) {
-  EventHandlerResult r = ::Cycle.onKeyswitchEvent(mapped_key, row, col, key_state);
-  if (r == EventHandlerResult::OK)
-    return mapped_key;
-  return Key_NoKey;
-}
-#endif
-
 };
 
 __attribute__((weak))

src/Kaleidoscope/Cycle.h

@@ -38,16 +38,6 @@ class Cycle : public kaleidoscope::Plugin {
 
   EventHandlerResult onKeyswitchEvent(Key &mapped_key, byte row, byte col, uint8_t key_state);
 
-#if KALEIDOSCOPE_ENABLE_V1_PLUGIN_API
-  kaleidoscope::EventHandlerResult onSetup() {
-    return kaleidoscope::EventHandlerResult::OK;
-  }
-
- protected:
-  void begin();
-  static Key legacyEventHandler(Key mapped_key, byte row, byte col, uint8_t key_state);
-#endif
-
  private:
   static Key last_non_cycle_key_;
   static uint8_t cycle_count_;