Added Gfx wait on LoadMenuEnd(). Otherwise, some levels would not start after loading all required files.
Also, added GPU wait on Menu.c before entering the main loop.
An invalid index inside sound table was being accessed when creating an arrival flight. This made the game crash only under real hardware.
Other minor changes and fixes.
* Makefile now rebuilds needed targets on modified header files.
* Some more work on GameEmergencyMode().
* Initial work on PSX mouse auto detection.
* Prototypes for RCNT2 I_MASK bit handling.
* DrawEnv and DispEnv buffers are no longer swapped using DMA commands, but GPIO. This ensures stability under real hw. TODO: how to fix in 2-player mode?
* Provisionally removed semi-transparency for aircraft shadow sprite.