xF1 Add-on [TH] Future Permissions 1.0.0a

This add-on adds the ability for other add-ons to check permissions at a future date, taking into account any user upgrades that are due to expire prior to that future date.

For example, in conjunction with this add-on, the Resource Events by Waindigo add-on allows you to remove the permission to RSVP to an event if that permission is only available through a user upgrade that will expire before the event occurs.

After installing for the first time, you will need to rebuild user caches in order for this to take into account existing user upgrades. This can be done by going to:
Admin Control Panel -> Tools -> Rebuild Caches -> Rebuild User Caches