Messages: Add hook after message action links.

[dcavins]

I'd like to make it possible for custom actions to be appended to the existing message action links as in the attached images. This would be useful for spam reporting, in my case. Patch attached.

[dcavins]

Added action link in messages loop.

[dcavins]

Custom action link added to single message thread header.

[dcavins]

Add a hook after the action links in the messages loop and in the header of an individual message thread.

[DJPaul]

I am happy with this because an action isn't going to break someone's theme on update, but let's let someone else sign-off before you commit this.

[r-a-y]

I hate adding new hooks, but it looks like it is necessary here.

Perhaps call the hook in messages-loop.php - 'bp_messages_thread_options' or 'bp_messages_inbox_thread_options'.

Perhaps call the hook in single.php - 'bp_after_message_thread_recipients' - since this hook would fire inside the <p id="message-recipients"> block.

Could use someone that has a better grasp of semantics here! :)

[dcavins]

In 10564:

Messages: Add hooks in loop and single templates.

Add an action hook to the thread options cell in
the messages loop template and another following
the "delete" link in a single message's
#message-recipients block.

Fixes #6775.