First commit for top-down text flow. Plus other changes.
 - Added links to usernames. Goes to their profile page.
 - Top down vertical flow to text. Was previously the reverse.
 - Shout display area inherits its background color from "main-content" class. Should blend in better with different punbb themes. Especially, dark ones.
 - Added box and border around it, so it resembles a sub-forum.
 - Added a link to delete messages, that is hardcoded to be enabled for Admins only. Currently disabled.
 - Disabled endlessscroll.js script, because I couldn't figure out how to make it play well with the top-down shouts flow.
 - Added a send button, so it's easier for mobile users to use.
 - Text entry box is set to fill as much width as possible. Character limit remains same as original.

Signed-off-by: James Hoffa <helliax+github@gmail.com>
Merge https://github.com/helliax/shoutbox_pun