Feature today animation

[dbmrq]

This improves the Today button animation with the code described at
#185.

[dbmrq]

Now I had the time to test this a little further and the animation looks almost perfect when there aren't any dot markers. When using dot markers it can look a little weird, though.

The animation scrolls to the following or to the previous month, depending on whether you're at a month before or after today, and then it fades in the current month. When there aren't any dot markers you can't notice this happens, but otherwise it could be a problem.
Assume, for instance, you have dot markers for all previous months, and none for the current month. Then scroll to one year from now and tap "Today". It'll scroll to one month before today and show a lot of dot markers, and then it'll fade in the current month, that doesn't have any. So it'll look like it flashed some dot markers randomly. Dot markers are already pretty unreliable, though, since they can't be updated (#267), so, if not using them, this is fine. I tried fixing this problem, but I don't see an obvious solution, we'd have to think it over.

For now I went back to the previous animation, I just think it looks better if it's done a little faster, so I changed the duration from 0.8 to 0.25. It looks quite alright.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs within the next 7 days. Thank you for your contributions.

[stale]

This issue has been automatically closed because it has been inactive for 45 days.