* Add rejuvenate command
Takes one or more entity uids as input. Attempts to find a DamageableComponent on that mob and heal all damage on it.
* Add rejuvenate to right click menu
* Update engine submodule
* Make suggested changes
- Remove redundant error checks in rejuvenate console command, add in relevant ones along with shell messages so the user knows what's going on.
- Remove localization of group check on rejuvenate verb, since the translated version wouldn't be in groups.yml this would've broken the verb in other locales.
- Have the rejuvenate verb attempt to heal the user by default if no arguments were provided to it.
* More localization + help message formatting improvement
* Add more suggested changes
