[AndyB] New direct message manager 1.0

Allows restricting new direct messages to staff only.

This add-on is useful where you want new members to only be able to start a new direct message with staff.

(Example of error message)

(Example of Options page)



Features:

All phrases start with newdirectmessagemanager_ for your convenience.

Questions and answers:

Q: Can I edit the "Oops we ran into some problems" message?
A: Yes. Edit the newdirectmessagemanager_php_please_start_a_direct_message_with phrase.