Tracking of receiver for incoming lambda's for outflow analysis + better handling of invoke and operator calls

idea/testData/slicer/outflow/lambdaResultWithInvokeCall.kt

@@ -0,0 +1,9 @@
+// FLOW: OUT
+
+fun test() {
+    val x = foo { <caret>1 }
+}
+
+fun foo(callback: () -> Int): Int {
+    return callback.invoke()
+}