UPDATE: Method update

CORE:
- ADDED: AddLocaleString and GetLocaleString core support

LuaEngine:
- FIXED: GetPlayerByGUID Global Method.
- FIXED: GetMapById Global Method.
- FIXED: GetGuildByLeaderGUID Global Method.
- FIXED: VendorRemoveItem Global Method.
- FIXED: VendorRemoveAllItems Global Method.
- FIXED: Ban Global Method.
- FIXED: GetItemLink Global Method.
- MODIFIED: Renamed all GetUnitType methods to GetObjectType, which is
more appropriate.