Rewrite with libvirt backend

This merge request rewrites Karton with a new UI and implements a libvirt backend.

I made a VM list that listens to libvirt events to update the UI. There's some basic functionality for starting and stopping the VM as well as viewing which is currently done through virt-viewer. VM installation page has minimal configuration as it creates VMs through the virt-install CLI.

Notes:

• You will need to specify an os-variant when making a new VM
  • For possible options, run osinfo-query os from libosinfo library.
• VM deletion button only undefines the domain.
  • After undefining, VM images are still stored in /home/username/.local/share/libvirt/images.
• List of dependencies can be found in readme

Warning: Still testing, running could potentially break existing libvirt VMs

TODO:

• finish VM creation dialog using virt-install
• fix updating VM list info
• OS icons as previously implemented (on hold)
• merge start/stop button (on hold)
• deletion button

Future ideas:

• implement Qt-Quick SPICE client instead of using virt-viewer
• configure and make domain .xml files directly with libvirt instead of using virt-install
• UTM-like sidebar
• system monitor for graphing CPU/memory usage
• VM snapshots
• more options for displaying the list like Boxes
• settings page (change b/w system and session hypervisor connection)
• browse for common OS' like Boxes

For more details, check out my GSoC proposal! Any feedback is much appreciated!

Gallery: