Replace Wayland borders from lib decor with our own

[andydotxyz]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

We can use the window draw info from the Fyne InnerWindow widget.

Is it possible to construct a solution with the existing API?

No response

Describe the solution you'd like to see.

Good looking borders on Wayland without the flakey dependency of libdecor.so