Introduce "use expression body" inspection #KT-16063 Fixed

Converted from the relevant intention
Reported cases: one-liners, whens
Also, more exact caret detection in local inspection tests

idea/testData/inspectionsLocal/useExpressionBody/convertToExpressionBody/functionLiteral.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+
+fun foo(handler: () -> Unit) { }
+
+fun bar() {
+    foo { <caret>zoo() }
+}
+
+fun zoo(){}