Full switch from rel nofollow to rel ugc

[SirLouen]

Considering that WP core from 5.3 has started using UGC, I think that to stay compliant bbpress shall move to this format

​https://make.wordpress.org/core/2019/10/03/wp-5-3-introduces-new-functions-to-add-ugc-attribute-to-links-and-implements-it-to-comments/

Essentially the fix is as simple as replacing bbp_rel_nofollow function to bbp_rel_ugc and the parts "nofollow" to ugc in includes/common/formatting.php

Then this can be moved to all filters within includes/core/filters.php and the bbp_rel_nofollow in includes/core/functions.php for the profile links also in the templates (templates/default/bbpress/user-profile.php

If this approved I can try to provide a patch.

[johnjamesjacoby]

Duplicate of #3318.

Hi @SirLouen, closing your issue in favor of an earlier one.

If you would like to make this patch, please feel free to do so over there.

Thank you!