PB Comments Plugin per scpc

Updates the formatting of comments on Crikey's 'Poll Bludger' blog. Specifically, does the following things:

- Restores display of avatars in each post
- Adds ability to preview before posting
- Adds ability to automatically quote a post when writing a reply
- Adds ability to view post date by hovering over the "x minutes ago" text
- Adds pagination controls/ability to jump to a specific page
- Includes built-in ad-blocking
- Automatically fetches and displays new posts without needing a page refresh
- Displays the post number of each comment
- Autoquotes when creating a threaded reply
- Reformats the comment header section
- Automatically renders quoted text in italics
- Avoids rendering the same comment(s) twice
- Allows configuration of the number of comments to load per page
- Allows nested comments to be toggled on and off
- Allows comments to be sorted newest first, or oldest first
- Fixes issue where quoting an emoticon truncates submitted replies

This plugin ONLY works at the following website:

https://blogs.crikey.com.au/pollbludger