Initial creation of GameShell.
Initial creation of ConfigWindow.
Refactor TR.getTRConfig() to indirect array.
Add POD/VOX list, interpolation, and stereo width to TRConfiguration.
Add configuration to File->Configure in RootWindow.
(missed commits for getTRConfig() refactoring)
Add support for stereo width tweaks in GPUResidentMOD.
Improved null-checking in getMOD() and changed pod list to a Set in
ResourceManager.
Redesigned RunMe to run GameShell instead of Game directly.
MusicPlaybackEvent and SoundSystem now support switchable interpolation
and MOD stereo width.