Research iortcw engine and adding QMM support

[thecybermind]

See issue #34.

• Support for loading "QVM version 2" (ioQuake3). At present, the extra jump table feature is only used in ioQuake3 when compiling the QVM before running, so the only real support needed for interpreting the QVM is handling the modified magic number in the header.
• Support for ioRTCW engine, both SP and MP (including QVM).
• Cleaned up game detection and the supported games list.
• Remove divide-by-zero check for QVM_OP_DIVF, as the ioRTCW multiplayer QVM does this, but the existence of inf/nan makes it not actually crash.
• Fixed a few bugs related to G_MEMCPY, G_MEMSET, and G_STRCPY QVM syscalls. They returned the engine's return value, which is args[0]. This, however, is the real converted pointer, and it was being returned into the QVM. These calls now all manually return the un-converted args[0] directly. It doesn't appear like any of the standard SDKs actually utilized this return value.
• Fix some missing/extra info in some log messages.