[Evolution] Add a "Today" button at the bottom of the picker

[Elfayer]

Hi,

I think it'd be a good feature to allow to get back to today's date like most date pickers.

It would have an option to show or not the button and simply replace the date with today's one.

I'm thinking of doing it myself, but I'd like to know if you'd agree (@ChiperSoft) with this feature?
Also, is this a complicated feature to implement with the existing code?

I haven't been going too deep in Kalendae source code.
Thanks a lot for the work so far.

Keep me updated! ;)