SpdLog_Create() is no longer externed through its header as its a static internal function. Moved SpdLog_Create() above SpdLog_Init() to fix the compile error and rename it to SpdLog_CreateRotatingLoggers(), which is a more suitable name.
* Make sure the workspace path actually exists before attempting to pack it.
* Make sure the VPK directory tree file was parsed correctly before unpacking store.
* Log debug output for each pack operation to a file.
* Fix bug in s_DirFileRegex regex pattern, which would include a trailing '_' in the context part of the directory tree file name.
* Fix bug in 'GetLevelName()' and 'GetDirNameParts()' causing it to parse the path as well, prune the path before running the regex.
* Renamed 'GetLevelName()' to 'PackedStore_GetDirLevelName()'.
* Renamed 'GetDirNameParts()' to 'PackedStore_GetDirNameParts()'.
* Write a front-end enable file when building client VPK's.
