Picasso: Solve mobile picasso drag and drop problem

[video](https://user-images.githubusercontent.com/7566995/200400255-5d7068ab-2d56-4249-9cbd-927bda184306.mp4)

This is a little tricky, but should be possible.
The goal ist to improve the UX for tablet (or maybe phone) users which try to move a schedule entry on the picasso.

If possible, also enable touch support for moving schedule entries.
If not, try to detect if a user uses touch input, and remind them that this is not supported with an SnackBar, a title or another ui hint which disapears again.
For people who use a mouse as input, nothing should change.

Do all that only if the edit mode on the picasso is active.