Fix image contraction scrolling bugs.
Fix DOM location of hovered images.
not needed
Optimize new Unread code.
Refactor adding of unread posts.
Unread.postsQuotingYou -> ECMAScript 6 Set
Overhaul quote threading.

- Separate post order data from read/unread status.
- Make compatible with unread line and scroll to last read post.
- Implement [Thread New Posts] link.
Release 4chan X v1.9.14.0.
Fix treatment of fetched deleted posts.
Release 4chan X v1.9.14.1.
Merge branch 'Stable' into Beta

Conflicts:
	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
Release 4chan X v1.9.14.2.
Move 4chan X v1.9.14.2 to stable channel.