New conversation manager v1.8 changes: Added 'Exclude user groups' to options page.
New conversation manager v1.7 changes: Now disallows "Invite more" if member is only allowed to start a new conversation with staff.
New conversation manager v1.6 changes: Added code to make more compatible with other add-ons.
New conversation manager v1.5 changes: Added Usernames filed to the options page. Regular members can only start a new conversation with these usernames set in the options page.
New conversation manager v1.4 changes: New posts in Options page can now be set to desired number.
New conversation manager v1.3 changes: Now compatible with PHP 7.4.
New conversation manager v1.2 changes: Fixed issue when creating a new conversation if the Recipients input was left empty it would throw a server error message.
New conversation manager v1.1 changes: Now properly getting and returning the parent code.
