1) New hookable Engine func: GetInfoKeyBuffer
2) New GameDLL func that can be called via engfunc: GetInfoKeyBuffer
3) New native: copy_infokey_buffer that copies data out of the specified info key buffer
4) EngFunc_InfoKeyValue, EngFunc_SetKeyValue, and EngFunc_SetClientKeyValue have been reworked
so that they expect pointers to an info key buffer in order to work properly o_O
5) Added some error messages to get_tr
1) Added get_orig_retval for retrieving the original return value of an engine function
2) Fixed engfunc being called with EngFunc_CheckVisibility so that it now works as intended
3) Hooks should now also work with FM_WalkMove, FM_TraceToss, FM_TraceMonsterHull, FM_TraceHull,
FM_TraceModel, FM_TraceTexture, FM_TraceSphere, FM_GetBonePosition, FM_GetAttachment, FM_RunPlayerMove,
FM_StaticDecal, FM_BuildSoundMsg and FM_CheckVisibility
4) Reformatted comments in some header files so they look a bit neater
