Ubo-app

- feat(rpc): add a proto generator which parses actions and events files and generates proto files for them
- feat(rpc): add `rpc` service with `dispatch` method to let external services dispatch actions and events to the redux bus
- fix(core): check if items added by `RegisterRegularAppAction` or `RegisterSettingsAppAction` cause duplicate keys and raise an informative error if so
- refactor(core): truncate long log items for log level `DEBUG` or lower to avoid cluttering the logs
- refactor(tests): add a delay between initializing different services to make sure they always run in the same order
- feat(rpc): add `subscribe_event` to the rpc service to let external services subscribe to events - closes 1
- test: better tooling for debugging uuid generation in tests
- fix(rpc): deal with messages with no prefix_package meta field
- refactor(core): prepare `REGISTERED_PATHS` earlier for each service, so that import error messages are more meaningful
- fix(vscode): stop and uninstall vscode service when logged out and install and start it when logged in - fixes 114

- feat(display): add display service and put display content in the bus via `DisplayRenderEvent`
- fix(vscode): restart vscode process whenever a login/logout occurs
- fix(docker): avoid instantiating `RegisterRegularAppAction` in the reducer before service is loaded as it needs service to be registered

- feat(lightdm): set wayland as the default session for lightdm after installing raspberrypi-ui-mods
- refactor(core): rearange menus
- refactor(docker): move docker settings from docker menu in apps to docker menu in settings, and move all docker apps up to make them direct children of the main apps menu, rename main "Apps" menu to "docker" apps and "Apps" inside settings menu to "Docker"

- build(packer): remove /etc/xdg/autostart/piwiz.desktop to avoid running piwiz as we already set ubo user
- fix(core): keep a reference for background tasks created with `async_.create_task` to avoid them getting garbage collected and cancelled
- fix(lightdm): update the menu when installation is done
- refactor(lightdm): reorder settings menu and replace "utilities" with "desktop"
- feat(lightdm): show a notification when rpi-connect is started to inform user desktop should be installed for the screen sharing to work
- fix(lightdm): install raspberrypi-ui-mods instead of lightdm to activate wayland and enable rpi-connect screen sharing
- test: fix an issue in tests which caused minor random store state changes, ruining snapshot assertions
- test: add vscode and rpi-connect services to `test_all_services` test
- refactor(housekeeping): improve store imports
- feat(store): add `DispatchItem` and `NotificationDispatchItem` as convenience `ActionItem` subclasses to dispatch actions and events
- feat(users): add `users` service to create, list, delete and change password of system users
- feat(ci): add `ubo-pod-pi5` to the list of github runners for `test`, also use it for `dependencies` and `type-check` jobs
- refactor(core): improve update-manager to be event driven
- feat(core): add `UBO_ENABLED_SERVICES` to complement `UBO_DISABLED_SERVICES` in controlling which services should load
- refactor(vscode): make it regularly read vscode status from its command line interface every second

- fix(notifications): notifications not getting closed nor updated

- refactor(core): use `dpkg-query` instead of `apt` python api as loading `Cache` in `apt` is slow and use it in docker service
- refactor(system): add response for docker commands and service commands
- feat(lightdm): add installation options for lightdm package
- refactor(notifications): update the `NotificationWidget` when it is visible and a new notification with the same id is dispatched