Highlight the date in the calendar

[F21]

It would be nice if the date set in the date attribute could have a special css class for it. This way, it would be pretty trivial to highlight today's date or the initial date set when initializing the widget using css.

selectDate() has been mentioned as a way to do this, but it is not really practical if we want to highlight today's date but also let people select different dates on the calendar.

Another possibility is to set up a customRenderer, but this is probably something pretty commonly used to warrant inclusion into the calendar core.

[F21]

After some investigation, it looks like the date attribute is normalized to the first day of the month at noon. The date attribute also change according to what month is being shown at the moment.

So the above will need an additional attribute to be introduced.