Different ports for our hosted tools

[RaananW]

Every tool in the local dev environment now has a different port. They all depend on the babylon server at port 1337.
Playground: 1338
Sandbox: 1339
NME: 1340
GUI: 1341
VSM: 1342

All can be overwritten by an environment variable, if needed.

[azure-pipelines]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[azure-pipelines]

Snapshot stored with reference name:
refs/pull/13166/merge

Test environment:
https://babylonsnapshots.z22.web.core.windows.net/refs/pull/13166/merge/index.html

To test a playground add it to the URL, for example:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/13166/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/13166/merge
https://sandbox.babylonjs.com/?snapshot=refs/pull/13166/merge
https://gui.babylonjs.com/?snapshot=refs/pull/13166/merge
https://nme.babylonjs.com/?snapshot=refs/pull/13166/merge

To test the snapshot in the playground with a playground ID add it after the snapshot query string:

https://playground.babylonjs.com/?snapshot=refs/pull/13166/merge#BCU1XR#0