Renormalize the redraw function

Have all instances take a function
Update the remaining modules to take this into account
Numerous smaller refactors to make some widgets work more or less the same

modules/clocks/display.go

@@ -5,28 +5,27 @@ import (
 )
 
 func (widget *Widget) display(clocks []Clock, dateFormat string, timeFormat string) {
-	if len(clocks) == 0 {
-		title := fmt.Sprintf("\n%s", " no timezone data available")
-		widget.Redraw(widget.CommonSettings().Title, title, true)
-		return
-	}
-
 	str := ""
-	for idx, clock := range clocks {
-		rowColor := widget.settings.colors.rows.odd
+	if len(clocks) == 0 {
+		str = fmt.Sprintf("\n%s", " no timezone data available")
+	} else {
 
-		if idx%2 == 0 {
-			rowColor = widget.settings.colors.rows.even
+		for idx, clock := range clocks {
+			rowColor := widget.settings.colors.rows.odd
+
+			if idx%2 == 0 {
+				rowColor = widget.settings.colors.rows.even
+			}
+
+			str += fmt.Sprintf(
+				" [%s]%-12s %-10s %7s[white]\n",
+				rowColor,
+				clock.Label,
+				clock.Time(timeFormat),
+				clock.Date(dateFormat),
+			)
 		}
-
-		str += fmt.Sprintf(
-			" [%s]%-12s %-10s %7s[white]\n",
-			rowColor,
-			clock.Label,
-			clock.Time(timeFormat),
-			clock.Date(dateFormat),
-		)
 	}
 
-	widget.Redraw(widget.CommonSettings().Title, str, false)
+	widget.Redraw(func() (string, string, bool) { return widget.CommonSettings().Title, str, true })
 }