Chat enhancement

[ErikYu]

• [x] Typing status sync
• [x] add loading when sending message
• [x] New message notification on header bar

more to be added...

[zackarychapple]

• [x] Make pressing enter send the message (add checkbox to disable this)

• [ ] Make seed include a few read and unread messages

• [x] Include ability to send messages to self

• [x] fix dark mode highlighting of active chat

• [x] remove you, that is known when its on the right side.

• [ ] name for individual typing does not need to be in the chat box, should be more like wechat, however this does not need to be there at all for 1:1 conversations.

• [x] search does not work for the messages search panel

• [x] no way to create group chat (should be part of our standard example), with all three default users and a little bit of history

[zackarychapple]

• [ ] logging out user1 resets the text between user 1 and user3 to some weird state

• [x] add support for pasting images into chat box, with x for removing them similar to slack.

  • [x] turn text box in message to rich editor (use our existing slate plugin, place icons and send on the bottom) similar to slack