[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-ecj/SynchronizedInAnonymousClass.java

@@ -0,0 +1,23 @@
+import lombok.Synchronized;
+public class SynchronizedInAnonymousClass {
+  Object annonymous = new Object() {
+    class Inner {
+      private final java.lang.Object $lock = new java.lang.Object[0];
+      Inner() {
+        super();
+      }
+      public @Synchronized void foo() {
+        synchronized (this.$lock)
+          {
+            String foo = "bar";
+          }
+      }
+    }
+    x() {
+      super();
+    }
+  };
+  public SynchronizedInAnonymousClass() {
+    super();
+  }
+}