4chan XT

4chan XT was originally forked from 4chan X for this PR, It is a migration of 4chan X from coffeescript to TypeScript/JavaScript. It is named XT both as a continuation of eXTended, and a T for TypeScript. The goals of this project is to first get a working bundle from js/ts files, and then gradually convert js files to ts and add types as needed.

New features since the fork include:

• Fetching the thread from an external archive and inserting deleted posts
• Basic audio posts support
• Automatically converting unsupported image files to png
• Automatically JPG'ing image files above the size limit
• Having both relative time and a timestamp on a post at the same time
• Counting poster ID's as a replacement of the deleted IP counter
• Hiding all posts from a poster ID in a thread
• A manifest v3 version for chromium browsers dropping support for v2
• A button to un-randomize a filename in the quick reply
• Showing the reason a post was filtered in the stub