Meta-issue: Make topic listing look more like phpBB's

Issue Summary

Here's what phpBB's topic listing looks like:

Here's what Advanced Forum's looks like:

Things of note:
- #474944: Show "New topic" / "Mark as read" buttons both above and below forum "New topic" buttons / "Mark all as read" are on the top and bottom.
- There's also a summary of number of topics and number of pages at the top and bottom.
- #474868: Add 'search within this forum' box There's a "search within this forum" form.
- #474952: Add "Announcements" feature There's a separate "Announcement" publishing option in the same place as "Sticky" which themes those in a their own box.
- #472604: "Topic icon" functionality When a "Topic icon" is used, it gets overlaid on the normal icon.
- When a topic has an attachment, it has a little paperclip icon next to it.
- #474958: Move created information under topic There is no "Created" column; the created data is smooshed in with the title.
- There is a "Views" column.
- #474960: "Last reply" => "Last post" "Last post" shows the original post if there are no comments, not "n/a".
- #474962: Add "Filter topics by date" functionality There is an exposed filter at the bottom for filtering by date: All topics, 1 day, 7 days, 2 weeks, 1 month, 3 months, 6 months, 1 year.
- There are exposed sorts at the bottom for sorting by author, post time, replies, subject, and views and ascending/descending
- #474966: Add "Jump to" forum navigation box There is a "Jump to" box for easy navigation between forums.
- #474998: Remove icon key There is no key to what the icons mean at the bottom.