Made the run script look for missing dependencies.

On Linux, MultiMC's startup script will now look for plugins with
missing depenedencies and warn the user about them if they are missing.
Fix typo
Disable some crazy OS X hacks on non-GCC compilers
Merge branch 'develop' of github.com:MultiMC/MultiMC5 into develop
Fix twitch
Fix various Dialogs (Titles, License formatting)
Make the account selection list use checkboxes rather than text for active boolean