[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/GetterLazyInAnonymousClass.java

@@ -0,0 +1,24 @@
+public class GetterLazyInAnonymousClass {
+	Object annonymous = new Object() {
+
+		class Inner {
+			private final java.util.concurrent.atomic.AtomicReference<java.lang.Object> string = new java.util.concurrent.atomic.AtomicReference<java.lang.Object>();
+
+			@java.lang.SuppressWarnings({"all", "unchecked"})
+			public String getString() {
+				java.lang.Object value = this.string.get();
+				if (value == null) {
+					synchronized (this.string) {
+						value = this.string.get();
+						if (value == null) {
+							final String actualValue = "test";
+							value = actualValue == null ? this.string : actualValue;
+							this.string.set(value);
+						}
+					}
+				}
+				return (String) (value == this.string ? null : value);
+			}
+		}
+	};
+}