The on-screen keyboard has been properly re-aligned everywhere.

Draw_Fill has been heavily optimized, is way safer, and now clears the whole screen (except the area where the 3D graphics are drawn) every frame.

Several bugs fixed, some still to go. The crosshair must be completely re-aligned and its code still needs a fair amount of refactoring.

After that, it will be time to test everything (except networking) for critical bugs, and update the readme a bit so I can release the version 1.5.