Few improvement ideas

[foxnoodles]

Just some more or less simple adjustments / additions from the top of my head. Mostly visual.

1. Load last loaded Channel + room on startup
2. Make channel and user avatars round
3. Make input field and message bubble corners rounded
4. Change username colors in message view to 10% darker or brighter to distinguish them from the msg body
5. Add ability show/hide emoji symbols in Rooms list for those who like cleaner look
6. Make "#" icons smaller both in the rooms list and in the header.
7. Force first letter capitalization in rooms list
8. Adjust panel border color for dark theme, it's almost white should be darker
9. Add tab indexes to elements for native keyboard control
10. Ability to use arrow keys to select channels, rooms, users

Thank your and good luck!