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 !
The code we execute here seems to be the same code that we run in `styleNewNames` inside of the `$('.userShape').each(function(){` block. I think that the best practice here to remove code duplication would be to redefine `styleNewNames` without the `$('.userShape').each(function(){` block, and to the then call this function in the `$('.userShape').each(function(){` and `$('.userShape:last-of-type').each(function(){` blocks when they're needed so that we only have one copy of this logic.