2.5: multiple small fixes

2.5: multiple small fixes

- wm draw method is now initialized correct when reading older
  files, but the SDNA bug causing the problem is still unsolved.
  is due to // char pad[8]; not being recognized as commented.
- triple buffer proxy texture test follows spec better now,
  was disabling triple buffer unnecessarily on some drivers.
- some cmake compile fixes related to sequencer pthread usage
  and removed bad level calls lib for player.
- show outliner header buttons in oops mode as well until that
  can be switched in the UI.
- fix region data free issue for tooltips
- warning fixes