Adds keyboard shortcuts to KWin for swapping, adding and removing virtual desktops. When swapping to the 0th/last+1 desktop, a new desktop will be added to make the swap possible.

Updated to the Plasma 6 API. Works with both Wayland and X11.

Default shortcuts are:
- Swap the current desktop's windows with next one: Meta+Shift+Alt+Right
- Swap the current desktop's windows with one above: Meta+Shift+Alt+Up
- Swap the current desktop's windows with one below: Meta+Shift+Alt+Down
- Swap the current desktop's windows with previous one: Meta+Shift+Alt+Left
- Add new desktop between current and next: Meta+Shift+Alt++
- Add new desktop between previous and current: Meta+Alt+=
- Remove current desktop and move its windows to next: Meta+Shift+Alt+_
- Remove current desktop and move its windows to previous: Meta+Alt+-

These can be changed in System Settings → Global Shortcuts → KWin → (search for swapdesktop2)