* Promoted size types in CUtlBuffer to int64.
* Fixed bug where CUtlBuffer::GetPtr returns a 64bit pointer that was promoted from a 32bit integral type.
* Use int64/size_t for anything strlen, pointer subtraction, etc..
* Removed invalid structure alignment declarations.
In Apex, the CUtlBuffer members seem to be signed 64bit instead. Changed type accordingly to align SDK structure with that of the engine. Added additional new fields that have been added to Apex.