KTailctl v0.20.0

Reworks the peer list as well as exit node page and indicates exit node usage in the tray icon. Also includes a lot of small bugfixes.

Features & Enhancements

Redesign peer list to fit entries into a single line
Add a tooltup to the tray icon showing some essential information about the current status
Add a tray menu to copy info about current node
Add separators between exit nodes
Indicate exit node usage in tray icon
Add links to Tailscale admin panel
Switch to maintained Twemoji fork
Improve the full build system by leveraging more of Extra CMake Modules
Leverage WindowStateSaver to save window geometry