>Code blocks and inline code that are preceded by RTL text will get displayed in RTL, and that breaks the formatting. This fix forces it to always display in LTR

Moved the changes to the `base.less` since it is not specific to RTL interface it also applies even if the user interface is LTR.

Remove the icons that are not mirrored to regular locations. And moved the icons that need mirroring to mirrored locations. Replaced "octicon-chevron-right" with new set of mirrored icons from fontello

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