Scripts

* Introduced GetGuidData/SetGuidData to store guids in instance scripts (GetData64/SetData64 are still there)
* CONDITION_INSTANCE_INFO: Changed existing DATA64 condition to GUID_DATA to preserve current use of this instance info type (most/all assume the data is a guid) and moved DATA64 to a different value - no db changes needed
* Fixed compile in boss scripts starting with letter A