Rearrange, remove clutter, rename

No real changes, only churn here
Fix performance problem in QuickModVersionList
Rename version_string to versionString
Fix line 79 in QuickModDependencyResolver.cpp
Fix build issues (Qt version discrepancy)
[QuickMods] Follow icon/logo redirects
Refactor QuickMods, split QuickModsList and give QuickModRef a separate file
Update to the latest version of the spec
Make QuickModIndexList a real model and finalize splitting it
Merge branch 'feature_spec_update' into develop

Conflicts:
	tests/TestUtil.h
Nuke. Things.