Run sudo-required action via actions.superuser_run
Actions related to services those require `sudo` permissions need to
be executed via actions.superuser_run.
NOTE:
If plinth service is started via `sudo ./run --debug` (in dev mode)
all actions will be executed silently. But plinth in user machines
won't be executed with sudo permissions.
- Do stricter matches when editing configuration file. Earlier
mechanism would match comments etc.
- Move action methods to module core from views.
- During first boot, notify users that console login is restricted and
that they can changed that from security settings.
- Recommend enabling conosle login restrictions. Add message about why
console restrictions are important.
- Show title in security module.
