v2 NEW FEATURE - AutoComplete for nicknames and users

[severenz]

AutoComplete feature is now offered on:

• Mail Compose
• User List (jump to profile)
• Room Loop fields on Add A Room

I imagine #3 will save a ton of time and make people happy.

Let me know if I've missed any other locations.

I do intend to overhaul the browse post-launch and offer a story jump using this same technique.