feat(RD): add texture pack downloader

This extends the resource pack downloader, with the custom behavior of
filtering the versions that shows up, to those <= 1.6. As always, Flame
is funky and requires a bit more workarounds than average.

This will also get a nice improvement when the Version parsing and
comparison PR gets merged! :D

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

launcher/ui/pages/modplatform/ResourceModel.h

@@ -98,7 +98,7 @@ class ResourceModel : public QAbstractListModel {
 
     /** Functions to load data into a pack.
      *
-     *  Those are needed for the same reason as ddocumentToArray, and NEED to be re-implemented in the same way.
+     *  Those are needed for the same reason as documentToArray, and NEED to be re-implemented in the same way.
      */
 
     virtual void loadIndexedPack(ModPlatform::IndexedPack&, QJsonObject&);