[Discuss] Private messaging

[galadhremmin]

There currently isn't a way for members to send private messages to one another on Parf Edhellen. All conversations are public. This sometimes leads to members leaving rather random-looking comments or questions on one another's profiles. A private messaging capability would make it easier for users to interact.

Important components:

• A 'message center' of sorts where you can see your ongoing conversations.
• Notifications when you've received a new message. Perhaps React application polling or similar?
• E-mail notifications that you've received a message.