[#1078] Fix variable for quickreply in entrypage
[#1078] Minimal quick reply, for the read page

Fixes #1078.
[#1078] Add the icon selector

* uses the old version of the icon selector (for now?)

* if the remote can use an icon browser, indicate so on hover/focus

* let the select dropdown accept data- attributes for use in JS

* update the icon preview if the selected icon changes
[#1078] Handle the case where the user has no icon
[#1078] Add a more minimal quick reply from the read page

Differences from quick reply from the entry page:

* only has icon (and icon browser), subject, comment + buttons for
  post/more options

* doesn't reload / redirect on page submit; instead just stays on the
  page and refreshes the current count

( refreshing the current count is not perfect: won't work when going
from 0 comments, and possibly won't be very good if the user has
customized their comments text to have additional numbers -- but that
seems fairly an edge case.

comment count refreshing won't work for custom layouts because we use CSS class/data-x
attributes. quicker-reply *may* work for custom layouts depending on how
they're coded)

Fixes #1078.