Add character identifiers to focusable widgets

When no widget has focus, press the letter key to focus on the widget
assigned to that letter.

Example:

    GitHub (d)

    Press "d" to focus on the GitHub widget.

todoist/display.go

@@ -16,7 +16,10 @@ func (widget *Widget) display() {
 		return
 	}
 
-	widget.View.SetTitle(fmt.Sprintf(" [green]%s[white] ", proj.Project.Name))
+	//widget.View.SetTitle(fmt.Sprintf(" [green]%s[white] ", proj.Project.Name))
+
+	widget.View.SetTitle(widget.ContextualTitle(proj.Project.Name))
+
 	str := wtf.SigilStr(len(widget.projects), widget.idx, widget.View) + "\n"
 
 	maxLen := proj.LongestLine()

todoist/widget.go

@@ -38,7 +38,7 @@ type Widget struct {
 
 func NewWidget(app *tview.Application, pages *tview.Pages) *Widget {
 	widget := Widget{
-		TextWidget: wtf.NewTextWidget(" Todoist ", "todoist", true),
+		TextWidget: wtf.NewTextWidget("Todoist", "todoist", true),
 
 		app:   app,
 		pages: pages,