This commit fixes the following bugs:
- Use of STL map on CUtlString, CUtlString does not have a lesser operator, thus it always fails to check whether or not the string is already present in the map. The tree structure cannot contain duplicates per tree scope.
- Use of backward slashes in vpk file tree structure, path separators should always be a forwards slash. The code was originally designed to be forwards slash only, but some paths were adjusted to take backwards slash, as the KeyValues class treats the '/' char as a delimiter for subfields. This has therefore lead into the whole code changing to it. The code has now been changed to the point where only the KeyValues utilities take the backward slash paths.
- Trailing slash character on file path, that ended up getting written as-is in the path tree.
The VPK tree builder is now part of a separate nested class in 'VPKDir_t'.
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