PyMCL a0.6 Pre-2

Preview 2 of PyMCL a0.6.
WARNING: EXPECT CRASHES, BROKEN BEHAVIOUR AND OTHER UNEXPECTED STUFF.

See changelog.md.

Known issues:

• Buttons on OSX are still messed up. I doubt I can fix this.
• Modpack exporter is defunct. I know, this is intentional.
• File size is double what its meant to be. Hopefully fixed next update.