Rework how posts are displayed in the modqueue:
* Rearrange post info to take up less space and to be consistent with
how posts are shown on the comments index.
* Reduce font size of approve / reject options.
* Reduce empty space around thumbnails and between posts.
* Add size info beneath thumbnails.
* Allow voting on posts.
* Use PostPresenter.preview to standardize rendering of thumbnails. This
adds parent/child borders, tooltips, and data attributes.
* Add options for changing the order of the modqueue (newest first,
oldest first, highest scoring first, lowest scoring first).
* Change the default order from oldest posts first to most recently
flagged or uploaded posts first.
* Add an order:modqueue metatag to order by most recently flagged or
uploaded in standard searches.
Add a sidebar to the modqueue page that shows the following information:
* Number of pending and flagged posts.
* Number of posts disapproved for poor quality or breaking rules.
* Top uploaders in the queue.
* Top artist, copyright, and character tags in the queue.
