Refactor and fix of the run/apply/let/also intention converter

1) Optimize and refactored code
2) Added support for correct renaming of target identifier to this/it
3) Added support of cases with difficult application targets (like: var x = 1 + 2)
4) Show error hint when refactoring failed for some reason
5) Improved intention applicability checking to eliminate false-positive cases
6) Fixed EA-209577

idea/testData/intentions/convertToScope/convertToApply/withNotSimpleInitializer.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+
+class MyClass {
+    fun foo() {
+        val c = 2 + 3
+        c.div(2)<caret>
+        c.div(c + 2 + c) + c.div(c)
+    }
+}