feat: move resource pack images to QPixmapCache

This takes care of evicting entries when the cache gets too big for us,
so we can add new entries without much worries.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/widgets/InfoFrame.h

@@ -40,7 +40,7 @@ class InfoFrame : public QFrame {
 
     void updateWithMod(Mod const& m);
     void updateWithResource(Resource const& resource);
-    void updateWithResourcePack(ResourcePack const& rp);
+    void updateWithResourcePack(ResourcePack& rp);
 
    public slots:
     void descriptionEllipsisHandler(QString link);