Add queue task to purge inactive users

[samerton]

Closes #3408
Closes #2248

New option in StaffCP Registration section

Successful run (cutoff 853 days)

Successful run (cutoff 0 days, i.e. disabled)

[partydragen]

We have a issue where banned users being made inactive, So this will result banned users even a short ban will result the user being deleted

Not sure if it just punishment that does this or if there is more places that can make a account inactive

Solution could been to remove it from punishments then make a update script to make all banned users active