insert stable master opcodes

needs some testings...
enable the OPCODE_HANDLER for OPCODE "MSG_LIST_STABLED_PETS"...
enable the other handlers for the stable-master
forgot one...
Update Opcodes.cpp
Update Opcodes.cpp
define MAX_PET_STABLES in Pet.h
Update WorldSession.h
undo latest commit because it's already inserted in PetDefines
Update Opcodes.h
undo this change because there's no script and it fixes an compile-error!

that's it...I hope someone can do the rest... :/
Merge pull request #23 from KaefGAMES/4.3.4

tryed to fix the stable master...tested on my server