Bump limit 2.1

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.

Bump limit v1.7 changes:

Fixed issue with members soft deleting last post in order to bypass the Bump limit function.

Bump limit v1.6 changes:

Now compatible with PHP 7.4.

Bump limit v1.5 changes:

Now supports secondary user groups.

Bump limit v1.4 changes:

Now using finder for performing database queries.

Bump limit v1.3 changes:

Added code to prevent server error log if user group permissions are not set.

Bump limit v1.2 changes:

Added additional User group permissions.