[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/AccessorsInAnonymousClass.java

@@ -0,0 +1,22 @@
+public class AccessorsInAnonymousClass {
+	Object annonymous = new Object() {
+
+		class Inner {
+			private String string;
+
+			@java.lang.SuppressWarnings("all")
+			public String string() {
+				return this.string;
+			}
+
+			/**
+			 * @return {@code this}.
+			 */
+			@java.lang.SuppressWarnings("all")
+			public Inner string(final String string) {
+				this.string = string;
+				return this;
+			}
+		}
+	};
+}