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).

bargraph/widget.go

@@ -22,7 +22,7 @@ type Widget struct {
 // NewWidget Make new instance of widget
 func NewWidget() *Widget {
 	widget := Widget{
-		BarGraph: wtf.NewBarGraph(" Sample Bar Graph", "bargraph", false),
+		BarGraph: wtf.NewBarGraph("Sample Bar Graph", "bargraph", false),
 	}
 
 	widget.View.SetWrap(true)