Implement general expresion remover

idea/testData/codeInsight/unwrapAndRemove/removeExpression/tryInBlock.kt

@@ -0,0 +1,10 @@
+// OPTION: 0
+fun foo(n : Int): Int {
+    <caret>try {
+        n/0
+    } catch (e: Exception) {
+        -1
+    }
+
+    return 0
+}