[fixes #2838] Handle anonymous classes properly

Generated qualified names (e.g. Outer.Inner) now stop at anonymous
classes instead of adding an empty part. All handlers that add static
fields/methods/types now add error messages instead of generating
invalid code.

test/transform/resource/before/WithInAnonymousClass.java

@@ -0,0 +1,12 @@
+import lombok.With;
+
+public class WithInAnonymousClass {
+	Object annonymous = new Object() {
+		@With
+		class Inner {
+			private Inner(String string) { }
+			
+			private String string;
+		}
+	};
+}