Settings tablet play area by using pen

[M4xi1m3]

Describe the new feature:
We should be able to set the play zone of the in-game tablet driver by setting for example the top left and bottom right corner by using the pen, instead of using sliders.
Proposal designs of the feature:
A button "Select area..." which would open a pop-up menu asking you to click on the top left corner of the desired play area and then asking you to click on the bottom right corner, for example.

[peppy]

A wizard for setting things up is planned in a future pass.