- fixed game / engine version numbers not being correctly sent to the API (due to bad int -> QString conversion)
- fixed download label being updated directly from the spawned thread which was working quite randomly. The thread now sends a signal to the main thread.
- fixed pk3 files not being deleted after downloading an older version. Example: if you downloaded current version 4.2.021 then version 4.2.018, the files belonging only to 4.2.021 weren't being deleted.
- put some static declarations in common.h