XF2 Addons Bump Limit 2.1

Prevents thread starter from bumping their thread until a certain time has expired.

Bump limit v2.1 changes:
Secondary user group time limits now properly override primary user group time limits.

Bump limit v2.0 changes:
Added 'Bump limit bypass hours' to options page.

Bump limit v1.9 changes:
Now includes two new User group permissions for bump limit times. Also improved error phrase shown to thread starter when they try to bump before time limit has expired.

Bump limit v1.8 changes:

Fixed null condition issue causing server error logs.