sm124futures: Enhanced editor stuff in progress.

Cycle between the different types of Tap Notes.
Hold/Roll heads do not count on this.

Obviously still being worked on, but the code
compiles at this point.

src/ScreenEdit.h

@@ -54,6 +54,10 @@ enum EditButton
 	EDIT_BUTTON_LAY_TAP_ATTACK,
 	EDIT_BUTTON_LAY_LIFT,
 	EDIT_BUTTON_REMOVE_NOTE,
+	
+	// These are modifiers to change the present tap note.
+	EDIT_BUTTON_CYCLE_TAP_LEFT,
+	EDIT_BUTTON_CYCLE_TAP_RIGHT,
 
 	EDIT_BUTTON_SCROLL_UP_LINE,
 	EDIT_BUTTON_SCROLL_UP_PAGE,