namespace properties are mostly working

idea/testData/codegen/fieldPropertyAccess.jet

@@ -0,0 +1,5 @@
+private var x = 0;
+
+fun increment(): Int {
+  return ++x;
+}

idea/testData/codegen/fieldSetter.jet

@@ -0,0 +1,7 @@
+var collector: String = ""
+  set(it) { $collector = $collector + it }
+
+fun append(s: String): String {
+  collector = s;
+  return collector;
+}