remove linked list stuff from Index
Implement webm thumbnail replacement.

Conflicts:
	LICENSE
	builds/4chan-X-beta.user.js
	builds/4chan-X.user.js
	src/General/css/style.css
	src/Images/AutoGIF.coffee
	src/Images/Gallery.coffee
	src/Images/ImageLoader.coffee
Clear event listener

Conflicts:
	builds/4chan-X-beta.user.js
	builds/4chan-X.user.js
Pause off screen and better clone handling for GIF/WebM etc. replacement
fix bug in WebM resetting
Merge branch '1.9.1.x'
Allow WebM replacement in quote preview thumbnails.
don't need to save the old thumb anymore
Release 4chan X v1.9.2.0.
queue ImageLoader downloads
fix error
move to next item in queue if taking too long
Release 4chan X v1.9.2.1.
Merge branch '1.9.1.x'

Conflicts:
	CHANGELOG.md
	LICENSE
	builds/4chan-X-beta.crx
	builds/4chan-X-beta.meta.js
	builds/4chan-X-beta.user.js
	builds/4chan-X-noupdate.crx
	builds/4chan-X-noupdate.user.js
	builds/4chan-X.crx
	builds/4chan-X.meta.js
	builds/4chan-X.user.js
	builds/4chan-X.zip
	builds/updates-beta.xml
	builds/updates.xml
	package.json
no more common thread
Release 4chan X v1.9.2.2.
forgot to remove this in d533f0 (Allow WebM replacement in quote preview thumbnails.)
fix pause off screen for clones
copy details at moment of replacement and from the correct thumb (in case of clones)
ImageLoader: refactoring, little fixes