adding kxmlgui5 support?

[crabdancing]

I probed ~/.config, and it turns out Konsole's Settings -> Configure Keyboard Shortcuts stores its data in a completely different file & format than most Plasma stuff. It dumps it under ~/.local/share/kxmlgui5/konsole/konsoleui.rc.

This is especially weird, since I use Plasma 6 -- but it seems like a lot of KDE Plasma applications store their keybindings this way. Documentation can be found here.

An example from my machine's current (test) config can be found here.

[HeitorAugustoLN]

I've worked on it this afternoon, I will test it when I can, so I can open a PR. You can take a look in here:
trunk...HeitorAugustoLN:plasma-manager:kxmlgui

[HeitorAugustoLN]

It doesn't seem to work right now, but I will continue working on it later.