* fixed crash when transforming irr to world coord, when maptile was not loaded
* fixed possible bugs wtih corpse object type
* removed name2-4 fields from item protos, they are useless
* added IsPlayer(), IsCreature(), etc functions to Object class. TypeID check sucks.
* changed item proto storage in ObjMgr to std::map instead of vector for faster lookup.
* added exception handling to ByteBuffer class to prevent possible crashes on invalid read access. this also fixes possible startup crashes with corrupted item/creature cache files.
* CHAT_MSG_MONSTER_SAY should work now (monster yell handled differently by MaNGOS?!)
* forgot last rev: no more stair effect on terrain. thx bLuma for patch!
* first preparations to correctly position gui camera on real location, not just somewhere. formulas are still crap, need some help here.
* fixed bug with IsFloatField(), thx bLuma!
* misc code cleanups
