faster directory moving (no recursive iteration on filesystem needed any longer)

main/commons/src/main/java/org/cryptomator/common/WeakValuedCache.java

@@ -1,6 +1,7 @@
 package org.cryptomator.common;
 
 import java.util.concurrent.ExecutionException;
+import java.util.function.BiConsumer;
 import java.util.function.Function;
 
 import com.google.common.cache.CacheBuilder;
@@ -40,4 +41,8 @@ public class WeakValuedCache<Key, Value> {
 		}
 	}
 
+	public void forEach(BiConsumer<Key, Value> function) {
+		delegate.asMap().forEach(function);
+	}
+
 }