Expand appropriate column of account selection dialog
Fix bugs introduced by unit test branch

Account json was getting rewritten by a folder
Missing icon on Windows (hopefully fixed, `doing it live`)
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Use asset sizes from the index to make the progress bar better
Improve group changing, update instance on version change

Gives a list of existing groups to choose from.
Instances are updated as long as there is at least one valid account.
Make updates prevented by missing accounts verbose
Fix/remove tests from the gutted updater
Merge branch 'updater_tests' of https://github.com/02JanDal/MultiMC5 into develop
Fix broken test (wrong URL)
Use monospace font in the console.

Still fugly as all hell, now in a slightly more appropriate style.
Merge remote-tracking branch 'upstream/develop' into updater_tests

Conflicts:
	mmc_updater/src/tests/CMakeLists.txt