Support Plasma 6.3

#22 adds support for Plasma 6.3; Thanks @nicolasfella

I'm having less and less time working on open source projects.
If anyone is interested in maintaining it, feel free to contact and I'll add them to collaborators :)

v0.13.0

What's Changed

• fix toggle all desktops button by @andrevmatos in #6
• the panel will always be shown when in plasma's edit mode (to ease editing) #7

v0.12.0

What's New

• Support "Per-Screen" active window tracking, see #4

Thanks

• for @luisbocanegra and @andrevmatos for fixing Qt6/Plasma6 support

If you think my work helps, feel free to buy me a subway.