small drawItemStack cleanup

-> Replace the three bool params with an enum
-> Add struct for the static content, leads to less repetition
-> cache enable_animations setting

src/hud.h

@@ -147,15 +147,20 @@ private:
 	video::SColor hbar_colors[4];
 };
 
+enum ItemRotationKind {
+	IT_ROT_SELECTED,
+	IT_ROT_HOVERED,
+	IT_ROT_DRAGGED,
+	IT_ROT_NONE, // Must be last, also serves as number
+};
+
 void drawItemStack(video::IVideoDriver *driver,
 		gui::IGUIFont *font,
 		const ItemStack &item,
 		const core::rect<s32> &rect,
 		const core::rect<s32> *clip,
 		IGameDef *gamedef,
-		bool selected,
-		bool hovered,
-		bool dragged);
+		ItemRotationKind rotation_kind);
 
 #endif