ZDoom language configurations update

- ACS:
  - Added STYLE_AddStencil and STYLE_AddShaded constants.
  - Added ChangeActorAngle and ChangeActorPitch functions.
  - A minor fix in SetActivator syntax.
- DECORATE:
  - Added AddStencil and AddShaded render styles.
  - Added CHAN_* and SPF_INTERPOLATE constants.
  - Added "flags" parameter for A_SetAngle.
- MAPINFO: Added DontCrunchCorpses flag for gameinfo block.