Provide option to override the default `do_not_reply` email address

[sudar]

In the recent version of bbPress, the way subscription emails are generated is changed and I see that you have made this commit to fix it. But unfortunately there are couple of problems in the way the default do_not_reply is generated. They are documented in this bbpress forum post and blog post

This ticket in bbPress fixes most of the issues with the default do_not_reply email address and also adds some filters so that people can change them if needed. The do_not_reply email address generation logic should be changed to the one that is used in the ticket so that it fixes the issues with it.

[solhuebner]

Any news on this one?

[pippinsplugins]

Sorry, I haven't had time to work on this yet.

[solhuebner]

Sorry for all the questions but this is just a really cool plugin ☺

[pippinsplugins]

We now use bbPress's helper function for getting the no reply address and it's passed through a filter so it can be changed for private replies.

/**
 * Retrieves the no reply address.
 *
 * @since 1.3.3
 *
 * @return string
 */
public function get_no_reply() {
    return apply_filters( 'bbp_private_replies_no_reply_address', bbp_get_do_not_reply_address() );
}