Misc: Use TODO() consistently in implementation stubs

#KT-13589 Fixed

idea/testData/intentions/declarations/convertMemberToExtension/abstract.kt.after

@@ -3,5 +3,5 @@ abstract class Owner {
 }
 
 fun Owner.f() {
-    <caret><selection>throw UnsupportedOperationException()</selection>
+    <caret><selection>TODO("not implemented")</selection> //To change body of created functions use File | Settings | File Templates.
 }

idea/testData/intentions/declarations/convertMemberToExtension/abstractProperty.kt.after

@@ -3,4 +3,4 @@ abstract class Owner {
 }
 
 val Owner.p: Int
-    get() = <caret><selection>throw UnsupportedOperationException()</selection>
+    get() = <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.

idea/testData/intentions/declarations/convertMemberToExtension/valWithDefaultGetter.kt.after

@@ -4,4 +4,4 @@ class Owner {
 }
 
 val Owner.p: Int
-    get() = <caret><selection>throw UnsupportedOperationException()</selection>
+    get() = <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.

idea/testData/intentions/declarations/convertMemberToExtension/varWithDefaultGetterAndSetter.kt.after

@@ -4,7 +4,7 @@ class Owner {
 }
 
 var Owner.p: Int
-    get() = <caret><selection>throw UnsupportedOperationException()</selection>
+    get() = <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.
     set(value) {
-        throw UnsupportedOperationException()
+        TODO("not implemented") //To change initializer of created properties use File | Settings | File Templates.
     }

idea/testData/intentions/declarations/convertMemberToExtension/varWithDefaultSetter.kt.after

@@ -6,5 +6,5 @@ class Owner {
 var Owner.p: Int
     get() = 1
     set(value) {
-        <caret><selection>throw UnsupportedOperationException()</selection>
+        <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.
     }

idea/testData/intentions/declarations/convertMemberToExtension/varWithGetter.kt.after

@@ -6,5 +6,5 @@ class Owner {
 var Owner.p: Int
     get() { return 1 }
     set(value) {
-        <caret><selection>throw UnsupportedOperationException()</selection>
+        <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.
     }

idea/testData/intentions/declarations/convertMemberToExtension/varWithSetter.kt.after

@@ -5,5 +5,5 @@ class Owner {
 }
 
 var Owner.p: Int
-    get() = <caret><selection>throw UnsupportedOperationException()</selection>
+    get() = <caret><selection>TODO("not implemented")</selection> //To change initializer of created properties use File | Settings | File Templates.
     set(v) {}