[9997] Some changes in HashMapHolder.

[newsbot]

<pre>m src/game/Level0.cpp
m src/game/ObjectAccessor.cpp
m src/game/ObjectAccessor.h
m src/shared/revision_nr.h

[9997] Some changes in HashMapHolder.

* Use ACE_RW_Thread_Mutex, since there's much more reading than writing.
* Use read lock in Find(), and write lock in Insert() and Remove().
* Correctly lock the hashmap on outside calls.</pre>



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