multi click support including buzzer toggle

src/helpers/ui/MomentaryButton.h

@@ -5,6 +5,8 @@
 #define BUTTON_EVENT_NONE        0
 #define BUTTON_EVENT_CLICK       1
 #define BUTTON_EVENT_LONG_PRESS  2
+#define BUTTON_EVENT_DOUBLE_CLICK 3
+#define BUTTON_EVENT_TRIPLE_CLICK 4
 
 class MomentaryButton {
   int8_t _pin;
@@ -13,6 +15,10 @@ class MomentaryButton {
   int _long_millis;
   int _threshold;  // analog mode
   unsigned long down_at;
+  uint8_t _click_count;
+  unsigned long _last_click_time;
+  int _multi_click_window;
+  bool _pending_click;
 
   bool isPressed(int level) const;