Messaging View Overhaul

This is the biggest push to date in terms of changes.
The PR addresses 7 issues in the workflow panel:

1. It fixes the conversation height issue, scrolling stops working bug on load
2. Conversation area height is also enlarged
3. It dynamically displays user initials in the conversation area
4. The options panel are hidden on mobile (mobile is conversation only)
5. Back home button has a slightly better styling
6. The conversation shapes are dynamically generated based on the number of participants and their colors

Check them out guys @psybuzz @nikilselvam !
Yes, it is because both background-color and box-shadow are changing. If you only specify one, the other will delay. Also, given that transitions are hardware accelerated, using transition all is effectively, the same as using a specified property. Changing these kind of CSS manipulation has no effect compared what jQuery is doing.