1) Fixed getting incorrect value of the entity index when using ClientUserInfoChanged via dllfunc
2) New hookable GameDLL funcs: UpdateClientData, AddToFullPack, CmdStart, CmdEnd (at28754)
3) New GameDLL funcs that can be called via dllfunc: UpdateClientData, AddToFullPack, CmdStart, CmdEnd
4) New natives to read/write special data structures associated with the above GameDLL funcs