Synchronise multiple applications

[romsson]

To enable collaborative occupyfication, users may be able to work on the same application. Every parameters should be shared (points positions, background images, color, ..)

Collaboration should be activated in the option panel and a unique ID may be added to the URL as well to share the app with others

[severo]

Some references for this:

• https://www.inkandswitch.com/local-first.html
• https://www.tiny.cloud/blog/real-time-collaboration-ot-vs-crdt/
• https://github.com/severo/gridify/issues/15

[severo]

First test at https://observablehq.com/@severo/hello-socket-io.

The code of the socket server will be versioned at https://github.com/LyonDataViz/socket-server