Add Ken's Labyrinth (LAB3D-SDL)

[erysdren]

Add Ken's Labyrinth by Ken Silverman to Haiku, via the LAB3D-SDL port originally created by Jan Lönnberg.

Changes:

• Add wrappers for open(), fopen() and SDL_LoadBMP() to respect Haiku user/data/etc directories.
• Pull game data from Ken Silverman's website (v2.1 registered).

Issues:

• OpenGL renderer crashes for unknown reasons. The SDL fallback software renderer works, though.
• If you generate a config, there's no way to regenerate it without going to the terminal and running it with the -setup switch.
• No application icon.