Save and load monitor position information. When the monitor is auto-positioned or dragged, a new location should be recorded in the monitor data.

* Update to VM hotfix version

This version is a custom build of VM, which has only this change applied to the currently deployed version https://github.com/LLK/scratch-vm/pull/1719

* Add HOC tracking px

Fixed some margins, added requires/collab library item section, and reminders to make extension/metadata-only.

Export the tutorial card URL query string handling for www.
Also fix typo

Adds `?tutorial=all` as a recognized option. Gui opens without the preview modal, and with the Tutorials Library open.

Back button in the Tutorials Library takes you to the Editor (not back to referrer).