rbutil: extend game file installation

RbUtil will now install freely distributable data files for Duke Nukem 3D,
Quake, SGT-Puzzles (fonts), Wolfenstein 3-D, and Another World. Currently
the urls point to my personal server, pending upload to the main download
server.

Change-Id: I2806fd1ad7e9bb0fcb7aee5444840708e6e63032
4 files changed