Work on new assets system. Working legacy assets importer, disabled assets downloading for now
More work on new assets system. Works given a properly constructed assets folder, no downloading yet
Merge branch 'feature_assets' into develop
Finish assets update for 1.7.3
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop

Conflicts:
	CMakeLists.txt
	gui/MainWindow.cpp