v0.3.1a: cleaned up quickslot autotargeting:

- quickslots will now only autotarget enemies they can actually auto-aim for.
- cleaned up code for determining which items should use targeting

src/com/shatteredpixel/shatteredpixeldungeon/items/Bomb.java

@@ -50,7 +50,10 @@ public class Bomb extends Item {
 	{
 		name = "bomb";
 		image = ItemSpriteSheet.BOMB;
+
 		defaultAction = AC_LIGHTTHROW;
+		usesTargeting = true;
+
 		stackable = true;
 	}