Migrating away from the notion of public/private URL in WorkAdventure Github repository

The notion of public/private repositories (with /_/ and /@/ URLs) is specific to the SAAS version of WorkAdventure.
It would be better to avoid leaking the organization/world/room structure of the private SAAS URLs inside the WorkAdventure Github project.

Rather than sending http://admin_host/api/map?organizationSlug=...&worldSlug=...&roomSlug=...., we are now sending /api/map&playUri=...
where playUri is the full URL of the current game.
This allows the backend to act as a complete router.
The front (and the pusher) will be able to completely ignore the specifics of URL building (with /@/ and /_/ URLs, etc...)
Those details will live only in the admin server, which is way cleaner (and way more powerful).

CHANGELOG.md

@@ -23,6 +23,10 @@
   - The chat allows your to see the visit card of users
   - You can close the chat window with the escape key
 - Added a 'Enable notifications' button in the menu.
+- The exchange format between Pusher and Admin servers has changed. If you have your own implementation of an admin server, these endpoints signatures have changed:
+  - `/api/map`: now accepts a complete room URL instead of organization/world/room slugs
+  - `/api/ban`: new endpoint to report users
+  - as a side effect, the "routing" is now completely stored on the admin side, so by implementing your own admin server, you can develop completely custom routing
 
 ## Version 1.4.3 - 1.4.4 - 1.4.5