GUI
- Add KiTTY to preconfigured telnet consoles. Fixes #3507
- Fix generic icon in Wayland. Ref #3501
- Use importlib instead of pkg_resources
- Upgrade to PyQt 5.15.9 and pywin32
- Add support for appliance version 8 format
Server
- Force English output for VBoxManage. Fixes #2266
- Automatically add vboxnet and DHCP server if not present for VirtualBox GNS3 VM. Ref #2266
- Fix issue with controller config saved before checking current version with previous one
- Prevent X11 socket file to be modified by Docker container
- Use the user data dir to store built-in appliances
- Catch ConnectionResetError exception when client disconnects