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/Application.cpp

@@ -611,6 +611,7 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
 
         m_settings->registerSetting("ModDownloadGeometry", "");
         m_settings->registerSetting("RPDownloadGeometry", "");
+        m_settings->registerSetting("TPDownloadGeometry", "");
         m_settings->registerSetting("ShaderDownloadGeometry", "");
 
         // HACK: This code feels so stupid is there a less stupid way of doing this?