v0.3.0c: refactor staff levelling, mages staff now gives a wand +1 max charges (magic missile reduced to 3 charges to compensate)

src/com/shatteredpixel/shatteredpixeldungeon/items/wands/WandOfMagicMissile.java

@@ -72,7 +72,7 @@ public class WandOfMagicMissile extends Wand {
 	}
 	
 	protected int initialCharges() {
-		return 4;
+		return 3;
 	}
 	
 	@Override