This contains a bunch of things packaged in 1:
1) UI improvements for the 3D viewer to support all sort of file types
and create a nice rendering in a clean way with all sort of options
2) enable people to use Filestash as an SDK so we can embed the 3d viewer
elsewhere
instead of inventing a new protocol for chunked upload that can be
resumed, we might as well use something that already exists like TUS.
As such we removed our custom implementation to favor that standard
