[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/after-delombok/SynchronizedInAnonymousClass.java

@@ -0,0 +1,15 @@
+public class SynchronizedInAnonymousClass {
+	Object annonymous = new Object() {
+
+		class Inner {
+			@java.lang.SuppressWarnings("all")
+			private final java.lang.Object $lock = new java.lang.Object[0];
+
+			public void foo() {
+				synchronized (this.$lock) {
+					String foo = "bar";
+				}
+			}
+		}
+	};
+}