Rename: Support renaming class by short reference to companion object

#KT-16108 Fixed

idea/testData/refactoring/rename/companionShortRef/after/test.kt

@@ -0,0 +1,9 @@
+class Bar {
+    companion object {
+        val VALUE = 42
+    }
+}
+
+fun main(args: Array<String>) {
+    println(Bar.VALUE)
+}

idea/testData/refactoring/rename/companionShortRef/before/test.kt

@@ -0,0 +1,9 @@
+class Foo {
+    companion object {
+        val VALUE = 42
+    }
+}
+
+fun main(args: Array<String>) {
+    println(/*rename*/Foo.VALUE)
+}

idea/testData/refactoring/rename/companionShortRef/companionShortRef.test

@@ -0,0 +1,5 @@
+{
+  "type": "SHORT_COMPANION_REFERENCE",
+  "mainFile": "test.kt",
+  "newName": "Bar"
+}