Made it so you can right-click on an item to use it, but yeah it's bad. Gotta refactor.

gui/fsm_events.hpp

@@ -20,13 +20,14 @@ namespace gui {
     LOOT_ITEM=15,
     LOOT_SELECT=16,
     INV_SELECT=17,
-    QUIT = 18,
-    MOUSE_CLICK=19,
-    MOUSE_MOVE=20,
-    MOUSE_DRAG=21,
-    MOUSE_DRAG_START=22,
-    MOUSE_DROP=23,
-    KEY_PRESS=24,
-    AIM_CLICK=25
+    USE_ITEM=18,
+    QUIT = 19,
+    MOUSE_CLICK=20,
+    MOUSE_MOVE=21,
+    MOUSE_DRAG=22,
+    MOUSE_DRAG_START=23,
+    MOUSE_DROP=24,
+    KEY_PRESS=25,
+    AIM_CLICK=26
   };
 }