Drop the V1 plugin API compatibility code

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

src/Kaleidoscope-LEDEffect-BootGreeting.cpp

@@ -86,19 +86,6 @@ EventHandlerResult BootGreetingEffect::afterEachCycle() {
   return EventHandlerResult::OK;
 }
 
-// Legacy V1 API
-#if KALEIDOSCOPE_ENABLE_V1_PLUGIN_API
-void BootGreetingEffect::begin() {
-  Kaleidoscope.useLoopHook(legacyLoopHook);
-}
-
-void BootGreetingEffect::legacyLoopHook(bool is_post_clear) {
-  if (!is_post_clear)
-    return;
-  ::BootGreetingEffect.afterEachCycle();
-}
-#endif
-
 }
 
 kaleidoscope::BootGreetingEffect BootGreetingEffect;

src/Kaleidoscope-LEDEffect-BootGreeting.h

@@ -34,16 +34,6 @@ class BootGreetingEffect : public kaleidoscope::Plugin {
 
   EventHandlerResult afterEachCycle();
 
-#if KALEIDOSCOPE_ENABLE_V1_PLUGIN_API
-  kaleidoscope::EventHandlerResult onSetup() {
-    return kaleidoscope::EventHandlerResult::OK;
-  }
-
- protected:
-  void begin();
-  static void legacyLoopHook(bool is_post_clear);
-#endif
-
  private:
   static void findLed(void);
   static bool done_;