Java to Kotlin converter: supported try-with-resource construct, fixed anonymous class generation + fixed a bug with method return type

#KT-4488 Fixed

j2k/tests/testData/ast/newClassExpression/newAnonymousClass2.kt

@@ -0,0 +1,11 @@
+abstract class A()
+
+class C() {
+    fun foo() {
+        val a = object : A() {
+            override fun toString(): String {
+                return "a"
+            }
+        }
+    }
+}