Core/DataStores: Add const to DBStorageIterator dereference operators

# Conflicts:
#	src/server/shared/DataStores/DBStorageIterator.h

src/server/shared/DataStores/DBStorageIterator.h

@@ -41,8 +41,8 @@ public:
         }
     }
 
-    T* operator->() { return _index[_pos]; }
-    T* operator*() { return _index[_pos]; }
+    T const* operator->() const { return _index[_pos]; }
+    T const* operator*() const { return _index[_pos]; }
 
     bool operator==(DBStorageIterator const& right) const { /*ASSERT(_index == right._index, "Iterator belongs to a different container")*/ return _pos == right._pos; }
     bool operator!=(DBStorageIterator const& right) const { return !(*this == right); }