[sm130labels] Code ready for testing.

If a mistake was made here,
let the cherry picking/blame game commence!

src/ScreenEdit.h

@@ -70,6 +70,9 @@ enum EditButton
 	EDIT_BUTTON_SCROLL_NEXT,
 	EDIT_BUTTON_SCROLL_PREV,
 
+	EDIT_BUTTON_LABEL_NEXT,
+	EDIT_BUTTON_LABEL_PREV,
+	
 	// These are modifiers to EDIT_BUTTON_SCROLL_*.
 	EDIT_BUTTON_SCROLL_SELECT,
 
@@ -456,6 +459,7 @@ public:
 		time_signature_denominator,
 		tickcount,
 		combo,
+		label,
 		warp,
 		NUM_TIMING_DATA_INFORMATION_CHOICES
 	};