Add a "send new message" link in the PM section - Issue 90

Joe H requested to merge NubWizard/tildes:send-new-message into master

Allows the user to send a new PM to a user via the Messages section of the sidebar menu on the settings page. This allows someone to type a username instead of navigating to the users profile or clicking on their profile from a comment. If a user is not found, the message "Username not found" displays. Once submitted, takes the user to their Sent messages inbox

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