Added drawCockpit() virtual method to Entity.

Also renamed wardraw_t to WarDraw, which have been using old naming
conventions.
Erased too old forward structure declarations and macro definitions.
Fixed ModelEntity.h and Autonomous.cpp fail to compile with Linux gcc.
Changed order of precedence for Player's camera mover cycle.

It now prefer cockpitview when the camera is chasing an Entity,
otherwise freelook.
surface: Added cockpit model to F15.