refs #781, use admit in database reader

* added amit functions in readers
* cacheHasChanged functions (needed because data of caches are loaded in background)
* pinned small caches
* CDatabaseReader::readInBackgroundThread uses admitCaches now

src/blackcore/db/infodatareader.cpp

@@ -56,6 +56,12 @@ namespace BlackCore
             Q_UNUSED(entities);
         }
 
+        void CInfoDataReader::admitCaches(CEntityFlags::Entity entities)
+        {
+            // no caching used here
+            Q_UNUSED(entities);
+        }
+
         void CInfoDataReader::invalidateCaches(CEntityFlags::Entity entities)
         {
             // no caching used here