Notifications system. Mainly to be used in case the updater breaks.
Fix for pre-Qt5.2
Don't try to check for notifications if we don't have a URL for it
Add the option to disable a certain message
Explicitly set the close button to be the default button
Fix mod list checkboxes
Fix library column stretching
Mess with the updater again.
Implement the beloved right click context menu. Just a copy of the instance toolbar
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Fix settings dialog tab ordering again
Fix logging string derp on OSX
Implement changing update channels

Allow the user to select which update channel they would like to
download updates from.
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Prepend a 5 to version strings.
Some more updater fixes

Paths were wrong - still used work directory instead of root
Add an option to force using local updater binary (for updater development)
More updater fixage

Preserve --dir parameter after updating
Allow more than one copy of a command line parameter in MultiMC
Linux runner script no longer changes current directory, which allows '--dir .'
Fixed unit tests, removed the obsolete one (for some legacy updater command line params that were also removed)
[fixes 63127704]
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Merge branch 'updater-tweak' into develop