Rename: this object, receiver argument -> dispatch receiver, extension receiver

compiler/testData/resolvedCalls/invoke/dispatchReceiverAsReceiverForInvoke.txt

@@ -0,0 +1,16 @@
+class Foo {
+    fun invoke() {}
+}
+
+fun bar(f: Foo) {
+    f<caret>()
+}
+
+
+Resolved call:
+
+Resulting descriptor: fun invoke(): Unit defined in Foo
+
+Explicit receiver kind = DISPATCH_RECEIVER
+Dispatch receiver = f {Foo}
+Extension receiver = NO_RECEIVER