Collect local declarations under properties (KT-14215); improve presentation of object declarations

#KT-14215 Fixed

idea/testData/structureView/fileStructure/AnonymousObjectMembers.kt

@@ -0,0 +1,15 @@
+class C {
+    val f = object : Runnable {
+        fun run() { }
+
+        fun xyzzy() { }
+    }
+
+    fun bar() {
+        val g = object : Runnable {
+            fun run() { }
+
+            fun xyzzy() { }
+        }
+    }
+}