For CUtl* classes: use the index type rather than just ssize_t, this will throw compile warnings for code that constructs a CUtl* object allocating more memory than the index type allows (e.g. allocating UINT16_MAX while the index type has been set to UINT8_MAX).
The class has been modified to match the implementation of the engine, the only modifications done were changing size types, so they compile to the correct size based on the platform (in case of the GameSDK project, this will be 64 bits).
