Refactored project name, changed cache extentions

Renamed .rscd cache file extentions to .wk. Corrected error in ground
texture numbering that was preventing dark browns greater than 128 to be
selected when they can normally. Changed config to load landscape.w from
%USERPROFILE%\CONF_DIR\CACHE_NAME\Landscape.wk to save time when
client/server testing landscape changes versus manually copying between
each folder after each save to test change.