* Return global pointer with 'KeyValuesSystem()'.
* Declare 'bCreate' as false by default for 'GetSymbolForString()' and 'GetSymbolForStringCaseSensitive()'.
* Added vftable interface for 'IFileSystem::RemoveSearchPath'.
* Added hook for 'CBaseFileSystem::AddSearchPath'.
* Added hook for 'CBaseFileSystem::RemoveSearchPath'.
* Added method in KeyValues for loading a KV file and parsing it via the game exe (loads from cache, vpk and disk).
* Added method in KeyValues to parse GameInfo.txt when the engine loads this.