Create Class from Usage: Support nested classes

This covers the case when original expression doesn't contains qualifier
Also for local or inner containing classes:
  - forbid nested objects
  - add 'inner' to nested class declaration

 #KT-16404 Fixed

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/createNestedObjectInInner.kt

@@ -0,0 +1,7 @@
+// "Create object 'Nested'" "true"
+class A {
+    // TARGET_PARENT:
+    inner class B {
+        val a = <caret>Nested
+    }
+}