There's a second variant without this definition, so this needs to be defined internally, and since it needs to be done internally it may receive proper localization labels.
- added command line options to load the original file dump of both mods in the game directory.
- both also require loading additional non-standard-named .art files
- consolidated the 3 identical S_OpenAudio implementations. The replacement code is disabled for the time being because it needs a rewrite. The replacement logic is uses is a bit too volatile.
- removed the old GRP scan code.
