[10469] Rename some opcode handler to better follow used naming style

[newsbot]

<pre>m src/game/ChannelHandler.cpp
m src/game/CharacterHandler.cpp
m src/game/GMTicketHandler.cpp
m src/game/ItemHandler.cpp
m src/game/MiscHandler.cpp
m src/game/MovementHandler.cpp
m src/game/Opcodes.cpp
m src/game/PetHandler.cpp
m src/game/QueryHandler.cpp
m src/game/WorldSession.h
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10469] Rename some opcode handler to better follow used naming style</pre>




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