Add inspections for implicit and explicit 'this' #KT-4580 Fixed

idea/testData/inspectionsLocal/explicitThis/differentReceiverInstanceExtension.kt

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+// PROBLEM: none
+
+class Foo {
+    fun test() {
+        Foo().apply {
+            <caret>this@Foo.s()
+        }
+    }
+}
+
+fun Foo.s() {}