If installed, require Watched Threads Filtering v1.7.0+
Fix setting prefix on an rss feed importer to an empty value
Add filtering of thread lists by "any prefix" or "no prefix"
When "Multiple prefixes filter type" is "and", filtering by "no prefix" and "any" will return no results!
Add Batch thread update actions; add/remove prefixes without overwriting all prefixes for a thread
Rebuild prefix rendering into template macros (sv_multiprefix_prefix_macros::render*) for HTML template generation to expose greated customization for styling.