whyisjake 9a0b89f7a8 Backporting several bug fixes.
- Query: Remove the static query property.
- HTTP API: Protect against hex interpretation.
- Filesystem API: Prevent directory travelersals when creating new folders.
- Administration: Ensure that admin referer nonce is valid.
- REST API: Send a Vary: Origin header on GET requests.
- Customizer: Properly sanitize background images.

Backports [46474], [46475], [46476], [46477], [46478], [46483], [46485] to the 4.4 branch.

Built from https://develop.svn.wordpress.org/branches/4.4@46498


git-svn-id: http://core.svn.wordpress.org/branches/4.4@46295 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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