Completely untested cuz I need to commit before I can merge the compile fix,...

Completely untested cuz I need to commit before I can merge the compile fix, but the intent of this commit is:

* Fix S_PLAY_FLY_TIRED animation being fast.
* Add moving tails to S_PLAY_SWIM animation!
* Fix autobrake happening when your controls are locked by pw_nocontrol/PF_STASIS. (Resolves #219, hopefully..?)