vweb: tmpl access to action method vars

examples/vweb/index.html

@@ -1,5 +1,4 @@
-test <b>app</b>
-
+Test <b>app</b>
 <br>
-
+<h1>@hello</h1>
 <hr>

examples/vweb/vweb_example.v

@@ -28,6 +28,7 @@ pub fn (mut app App) json_endpoint() {
 pub fn (mut app App) index() {
 	app.cnt++
 	//app.vweb.text('Hello world from vweb')
+	hello := 'Hello world from vweb'
 	$vweb.html()
 }