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/removeRedundantSpreadOperator/emptyArray.kt

@@ -1,5 +1,5 @@
 fun foo(vararg x: String) {}
 
 fun bar() {
-    foo(*emptyArray<caret><String>())
+    foo(*<caret>emptyArray<String>())
 }