Label sign bg events

include/constants/event_bg.h

@@ -0,0 +1,10 @@
+#ifndef GUARD_CONSTANTS_EVENT_BG_H
+#define GUARD_CONSTANTS_EVENT_BG_H
+
+#define BG_EVENT_PLAYER_FACING_ANY   0
+#define BG_EVENT_PLAYER_FACING_NORTH 1
+#define BG_EVENT_PLAYER_FACING_SOUTH 2
+#define BG_EVENT_PLAYER_FACING_EAST  3
+#define BG_EVENT_PLAYER_FACING_WEST  4
+
+#endif // GUARD_CONSTANTS_EVENT_BG_H