Export scene button

[nearnshaw]

Add a button on the Creator Hub to export the scene as a zip file. This export won't include the node_modules folder or other OS-dependant files, which would make it a weigh a lot less, and remove risks of issues. This zip can then be easily shared with other content creators, for Game Jam submissions, etc.

This .zip should also be useful on other tools, for example the Builder In World tool developed by the community allows you to import a scene as a .zip and publish with an automated pipeline to land owned by this community project.

The exported .zip file should go to the /downloads folder on your machine, to make it easier to find. The scenes or the Creator Hub folder is quite an effort to find, as part of the path is hidden.