Keep playing .webms in clones.
Wait for the video metadata to be loaded before completing the expansion.
Don't add the 'expanding' class when unecessary.
Pause videos when they are not visible. #1538
Automatically play/pause videos in clones too.
Fix EAI loading files in hidden posts. Fix #1542
Changelog.
Release 4chan X v3.20.3.
After contracting, isExpanding should be falsy.
gallery thumbnail shouldn't clone contracted image/video
contract thumbnails in hover preview

... and don't clone the video element
set up clones of videos properly
change UI for no autoplay, no controls
Merge branch 'ccd0' into v3

Conflicts:
	builds/4chan-X.user.js
	builds/crx/script.js
	src/General/Get.coffee
	src/Images/Gallery.coffee
Merge branch 'mayhem' into v3

Conflicts:
	CHANGELOG.md
	package.json
	src/Images/ImageExpand.coffee
indentation