Filtering of moderation and blacklist keys

[satollo]

The proposed patch adds a filter to the blacklist and moderation keys used by bbpress which are the ones used by WordPress to check comments.

That filter lets external plugins to add/change the keys.

[satollo]

Patch to the includes/common/functions.php

[satollo]

The correct patch file, sorry.

[thebrandonallen]

New patch adds appropriate filters and PHPDoc. Also cleans up bbp_check_for_moderation to bring it in line with bbp_check_for_blacklist which bails early on and empty blacklist keys.

[netweb]

Replying to thebrandonallen:

New patch adds appropriate filters and PHPDoc. Also cleans up bbp_check_for_moderation to bring it in line with bbp_check_for_blacklist which bails early on and empty blacklist keys.

It also bailed before the "Max Links" check, 2861.3.patch​ puts this before the moderation words bail check

[thebrandonallen]

Yep. Missed that. New patch alters the changeset reference for the moderation filter back to rXXXX instead of the r6049, that slipped in on 2861.3.patch​.

[netweb]

In 6050:

Moderation: Add new bbp_moderation_keys and bbp_blacklist_keys filters

This changeset allows external plugins to filter the list of moderation and blacklist keyword terms, IP, URLs, words, etc.

Also cleans up bbp_check_for_moderation() to bails early if there are no moderation keys inline with bbp_check_for_blacklist()

Props thebrandonallen, satollo.
Fixes #2861.