This change also alters how edits are displayed both for sequential
and non-sequential messages.

See #1357

This comes in the form of the user's avatar, along with a hover
title that shows username and edit time. As a side note, this
requires us to start saving 'editBy' id as part of message updates.

This has been tested with all 4 of the current avatar methods.

fixes #824

Note that this also makes a minor tweak to scope of "if description"
check in admin.html, that is more correct.

This change also swaps out the settings group display from <h3>
to <p> for a better look and feel.

Firefox interprets user-select: all; to mean that any clicks should result in
the entire element's container being selected, regardless of the user's gesture.
This results in the inability to select only a subset of characters in a chat
message.

Fixes #1242

- Adding padding / margin
- Changing cursor to pointer
- Adding background-color on hover

- Displaying links as block-level elements
- Adding padding / margin

Displaying as block-level element.