video hover
add WebM to supported posting types, bypass width/height check for now
global sound option
Release 4chan X v1.5.1.
Merge branch 'ccd0' into v3

Conflicts:
	CHANGELOG.md
	builds/4chan-X.user.js
	builds/crx/script.js
	src/Images/ImageHover.coffee
	src/Posting/QR.coffee