v1.2-pre1

A testing release for version 1.2 with a fully working add-on manager among many other additions and changes. I can't test any executables besides the Linux one myself. I used to be able to use WINE to test the Windows one, but that no longer works as of PyInstaller v3.6.

Current main changes:

• Addon manager
  Manage, update, and browse/download
  • plugins (with dependency checking)
  • themes (DDO support too!)
  • music (.abc files/collections of files)
• Multiple accounts support
• Custom directory selection in setup wizard
• Many more smaller improvements