Feature Idea: Add the ability to request a "one time" reboot

[BigMacAdmin]

Taking note of this idea:

• Sometimes you need users to reboot outside the kind of time based windows Renew is using.
• What if we add a flag by using something like sudo defaults write /Library/Preferences/com.secondsonconsulting.renew.plist "RequireRestart" -int $(date +%s)
• This would require admin rights to configure, but non-admins should be able to read
• Renew could look for this flag, and if the last startup time is less than the date in that file, could have a special kind of "you need to restart" window appear.

Do we have to require a specific Title/Message/Icon key for this "ForceRestart" window? If those values aren't set, do we use default messaging? (that may mean new translations for non-english languages)