Adds per-monitor layout matching with wildcards, resolution etc…

[MarcinOrlowski]

BTW bug fix - Fixed a bug in getCurrentLayout(): if (!screenLayouts[key]) treated a remembered layout 0 as unset. Harmless before, but it has to be an undefined check now that the stored value is validated against the applicable set.

Closes #214 <-- main ticket

Closes #199
Closes #107
Closes #209

[KernicDE]

Tested this locally on KDE Plasma 6.7.4 (Wayland) with two monitors:

• DP-1: 3440x1440 (horizontal)
• DP-2: 1080x1920 (vertical)

Created per-monitor layouts using match with display + resolution and it works as expected. Each screen only sees the layouts matching its criteria, and cycling only goes through the applicable ones.

Thanks for the more comprehensive approach compared to the simple screen-name filter I had drafted.

[jarpoole]

I also just tested this on Plasma 6.7.4 (Frameworks 6.29.0, Qt 6.11.1) on NixOS 26.11, Wayland with a triple monitor setup and it works beautifully!