Remove the app.Draw() gorountine

Prefer to have widgets force a draw when their data changes. This should
reduce draws (unless the user has a module installed that updates >=
1/sec, the old draw default).

This should also remove a source of some of the race conditions that
users were experiencing (though not all, there are still many).

hackernews/widget.go

@@ -35,7 +35,7 @@ type Widget struct {
 func NewWidget(app *tview.Application, pages *tview.Pages) *Widget {
 	widget := Widget{
 		HelpfulWidget: wtf.NewHelpfulWidget(app, pages, HelpText),
-		TextWidget:    wtf.NewTextWidget("Hacker News", "hackernews", true),
+		TextWidget:    wtf.NewTextWidget(app, "Hacker News", "hackernews", true),
 	}
 
 	widget.HelpfulWidget.SetView(widget.View)