Log Message:
fasttracker2: Update to b167

Removes outdated MASTER_SITES.

Changes since b166:

Beta #167 - 25.08.2019
- Crashfix: After loading a sample from a file, the tracker would start to
  behave strangely and could crash in certain scenarios. This is yet another
  bug from beta #163. Sorry for all the serious bugs after that version,
  but I think I have fixed them all now!
- Bugfix: Custom user colors/palette wouldn't be saved to config at all