[9327] Replace leader based indexing groups by group ids.
 

<pre>m src/game/Creature.cpp
m src/game/Creature.h
m src/game/Group.cpp
m src/game/Group.h
m src/game/GroupHandler.cpp
m src/game/ObjectMgr.cpp
m src/game/ObjectMgr.h
m src/shared/revision_nr.h

[9327] Replace leader based indexing groups by group ids.

* This must repolve problem with loot.
Before if some mob killed by group member and then leader changed
then group members can't loot this mob body.
* Possible resolve crashes at loot. Now group storage content not dependent from leader changes.</pre>



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