Instead of saving .sb3 files to the projects server, save just the project JSON. Save assets to the assets server. This happens via the asset types being routed to different web sources by storage.

These files have diverged from the versions stored on the assets server due to the way Git handles line endings. Re-save them and keep their line endings from changing again by treating SVGs as binary in this repo.

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).