[10640] Implement instance guids with proper HIGHGUID_INSTANCE use.

[newsbot]

<pre>m src/game/CalendarHandler.cpp
m src/game/InstanceSaveMgr.h
m src/game/MapInstanced.cpp
m src/game/MapManager.cpp
m src/game/MapManager.h
m src/game/ObjectGuid.cpp
m src/game/ObjectGuid.h
m src/game/ObjectMgr.cpp
m src/game/ObjectMgr.h
m src/game/Player.cpp
m src/game/World.cpp
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10640] Implement instance guids with proper HIGHGUID_INSTANCE use.

Signed-off-by: VladimirMangos <vladimir@getmangos.com></pre>




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