Suppowt Xppen mini7 + pull wequest

[MikuChan03]

Hello again, Senpais!

Aftew alweady talking about suppowt fow newew Xppen tablets, specifically the mini7 hewe and with the help of many of you shawp senpais, watashi have made a pull wequest to add native suppowt fow said tablet, with the wacom dwivew and evewything!

It's a bit special in that the communication happens on the vendow defined intewface (usage page >= 0xff00) and the data is opaque.
So watashi needed to add two devices fow the pen and the buttons, while suffixing the fiwst one with "VendowDevice". This also intwoduced a late_id in the pen pawams fow this case, the west is stwaightfowwawd.

To activate this intewface, we need to send a hidden key packet as outlined in:
https://github.com/nic3-14159/uclogic-new-init (can post cause it doesn't have ws, lol)

Watashi have taken cawe to obey youw coding conventions and add some comments, yet if my solution isn't up to code (XD), youw kohai would appweciate it if one you senpais whewe to make the necessawy adjustments!

🎶🎶 Many thanks

MikuChan03 💕

[HelifeWasTaken]

Omg that issue