Create from usage: make new member function/property private by default

#KT-6689 Fixed

idea/testData/quickfix/createFromUsage/createVariable/property/afterMemberValDelegateRuntime.kt

@@ -5,6 +5,6 @@
 import kotlin.properties.ReadOnlyProperty
 
 class A<T> {
-    val foo: ReadOnlyProperty<A<T>, A<Int>>
+    private val foo: ReadOnlyProperty<A<T>, A<Int>>
     val x: A<Int> by foo
 }

idea/testData/quickfix/createFromUsage/createVariable/property/afterMemberValNoReceiver.kt

@@ -3,7 +3,7 @@
 
 class A {
     class B {
-        val foo: Int
+        private val foo: Int
 
         fun test(): Int {
             return foo

idea/testData/quickfix/createFromUsage/createVariable/property/afterMemberVarDelegateRuntime.kt

@@ -5,6 +5,6 @@
 import kotlin.properties.ReadWriteProperty
 
 class A<T> {
-    val foo: ReadWriteProperty<A<T>, A<Int>>
+    private val foo: ReadWriteProperty<A<T>, A<Int>>
     var x: A<Int> by foo
 }

idea/testData/quickfix/createFromUsage/createVariable/property/afterObjectMemberValNoReceiver.kt

@@ -3,7 +3,7 @@
 
 class A {
     object B {
-        val foo: Int
+        private val foo: Int
 
         fun test(): Int {
             return foo

idea/testData/quickfix/createFromUsage/createVariable/property/afterPrivateForMembers.kt

@@ -0,0 +1,9 @@
+// "Create property 'foo'" "true"
+// ERROR: Property must be initialized or be abstract
+class A {
+    private var foo: Int
+
+    fun test() {
+        foo = 1
+    }
+}

idea/testData/quickfix/createFromUsage/createVariable/property/afterThisInClass.kt

@@ -2,7 +2,7 @@
 // ERROR: Property must be initialized or be abstract
 
 class A<T>(val n: T) {
-    val foo: A<Int>
+    private val foo: A<Int>
 
     fun test(): A<Int> {
         return this.foo

idea/testData/quickfix/createFromUsage/createVariable/property/afterThisInNestedClass1.kt

@@ -3,7 +3,7 @@
 
 class A<T>(val n: T) {
     inner class B<U>(val m: U) {
-        val foo: A<Int>
+        private val foo: A<Int>
 
         fun test(): A<Int> {
             return this.foo

idea/testData/quickfix/createFromUsage/createVariable/property/afterThisInNestedClass2.kt

@@ -2,7 +2,7 @@
 // ERROR: Property must be initialized or be abstract
 
 class A<T>(val n: T) {
-    val foo: A<Int>
+    private val foo: A<Int>
 
     inner class B<U>(val m: U) {
         fun test(): A<Int> {

idea/testData/quickfix/createFromUsage/createVariable/property/beforePrivateForMembers.kt

@@ -0,0 +1,7 @@
+// "Create property 'foo'" "true"
+// ERROR: Property must be initialized or be abstract
+class A {
+    fun test() {
+        <caret>foo = 1
+    }
+}