private messages

[trinkey]

What does this do?

adds private messages. these can be accessed via the envelope button. to send a message to a specific person, you go to their profile and click the "message" button. once you do that, they will be found in the messages section.

Issues completed:

• fixes #95

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Checklist for Reviewers

• [x] Version has been incremented (if appropriate)
• [x] BACKEND.md has been updated for any new functions
• [x] Code is formatted good enough (ask @trinkey)
• [x] Any new changes have been tested thoroughly (including api calls that wouldn't normally be possible using inspect element or /api/docs)
• [x] Features that break easily have been tested (mostly viewing pages when not logged in)

[trinkey]

Looks good

remember what happened last time we didnt properly test?