Add label only mode

[anunesse]

The label only mode allow the gauge to be configured so that only the label is displayed.

By default labelOnly has no effects on the directive.

If labelOnly mode is set to true then the value is hidden and the label is drawn as the value in the canvas.

I added a test and I just need to add this option to the documentation.

[martinschuberts]

It's a very useful option if you want to show e.g. "5,5 MW" but your value is 5500, or for a time showing 5min and your real value was in milliseconds.

[ashish-chopra]

Thanks @anunesse ,

This is amazing. And you handled the font very well.

• This will give options to other to manipulate/convert the value outside the gauge and pump into it through label.

Thanks man!

Cheers
Ashish