* bugfixes:
o the Glide 3 FOGCOORD extension now works properly on the R200 tier1 path (previously there was no fog in Glide64)
o fix (rare, corner case) chroma keying glitches on the tier2 path (regression; introduced with the tier0 chroma stuff in 0.84b)
* work around a vertex program compiler issue in DeltaChrome drivers. This fixes the instant crash on startup. These cards still don´t work well with this wrapper, though.
* allow running the r200 tier1 path on S3 DeltaChrome. It supports the required extensions with recent drivers.
* multi-user support workaround: store successfully expanded %appdata% values in HKCU portion of the registry. If the system later fails to expand the %appdata% string, this previous expansion will be used instead. This fixes configuration issues with "game launchers" that don´t pass environment strings to their child process (e.g. Carmageddon 2).