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.
+ Added first tutorial level.
* Font now inserts line feed automatically if the next word is too long to fit.
* Gfx.c: added primitive list double buffering in order to gain some performance.
* MapEditor: now airport can be defined inside the tool.