Use the right LWJGL path while creating an instance
Recover from the bin folder of converted legacy instance being deleted.

Use the new vanilla jar as the base jar if mcbackup.jar is missing.
Fix console not staying open on minecraft crash
Fix signal derp from previous commit

Console should now properly close/not close based on minecraft return code/signal.
Merge remote-tracking branch 'upstream/develop' into develop-nonpremium