Introduce Parameter: Fix parameter name validation

Respect existing parameter names and fix some exceptions

 #KT-19439 Fixed
 #KT-20402 Fixed
 #KT-20403 Fixed

idea/testData/refactoring/introduceParameter/avoidClassDuplicatingParameters.kt

@@ -0,0 +1,3 @@
+class Foo(i: Int) {
+    val x = <selection>1 + 2</selection> + 3
+}

idea/testData/refactoring/introduceParameter/avoidClassDuplicatingParameters.kt.after

@@ -0,0 +1,3 @@
+class Foo(i: Int, i1: Int = 1 + 2) {
+    val x = i1 + 3
+}

idea/testData/refactoring/introduceParameter/avoidFunDuplicatingParameters.kt

@@ -0,0 +1,3 @@
+fun foo(i: Int) {
+    val x = <selection>1 + 2</selection> + 3
+}

idea/testData/refactoring/introduceParameter/avoidFunDuplicatingParameters.kt.after

@@ -0,0 +1,3 @@
+fun foo(i: Int, i1: Int = 1 + 2) {
+    val x = i1 + 3
+}

idea/testData/refactoring/introduceParameter/superCallArgument.kt

@@ -0,0 +1,9 @@
+class A : B({ "${<selection>C.c</selection>}" })
+
+class C() {
+    companion object {
+        val c = 23
+    }
+}
+
+open class B(param: () -> String)

idea/testData/refactoring/introduceParameter/superCallArgument.kt.after

@@ -0,0 +1,9 @@
+class A(val i: Int = C.c) : B({ "$i" })
+
+class C() {
+    companion object {
+        val c = 23
+    }
+}
+
+open class B(param: () -> String)