They could not be parsed properly by crowdin causing translations issues

 - Add conditions to know which adapter exactly is currently in use
 - Add expressions to get the connection settings of the adapter

Co-authored-by: Arthur Pacaud <arthur.pacaud@hotmail.fr>

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

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 - Complete getting started tutorial
 - Add page about picking an adapter

- Replaced them with webm files
- Removed autoplay
- Added controls (play, pause, seek...)

THNK Rooms (or THNK Relay) is a new adapter that allows to connect using a simple rooms system. Any user can create a room with any name, and any other user can connect to the room with the same name.

It will be extended in the future to allow querying room names based on numerous criterion, to allow doing matchmaking.

Adds a *Local adapter*, which is very useful for local testing. It can start multiple client windows at once alongside the server!

 - Only import node libraries once an electron environement has been confirmed, as to not cause a crash when the extension exists in a multiplatform project.
 - Download the geckos server in appdata, as that never requires administrator privileges and is less prone to bugs.
 - Use path.join for cross-platform paths (although only windows is supported in previews still)

Works around a bug in GDevelop when deleting an object at the first frame by redeleting it on the second frame.

This internal change shouldn't change anything but unblock progress on many other features, like different diffs per player, UDP packet loss compensation, etc.

Fixes spelling mistakes in the docs and README

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>