Detect IRIS-based Health* platforms correctly

[gjsjohnmurray]

This PR fixes #141 by checking $zversion for "Cache" or "IRIS" prefix.

It also adds .vscode to .gitignore so contributors can use VS Code as their editor.

[nikitaeverywhere]

Looks good!

Whenever you need a release, please draft a PR – I'll merge it too.

Regarding #148, yup, at the time of development there were not much we could to do set up automated testing or something, I wish we had it. So any release can potentially break things, and it's good if people report it, but many won't. In such cases, I would probably advice to revert & investigate.

When it comes to /terminalsocket, and classes /terminalsocket/ClassName.csp or something (I don't remember clearly), the class name after the application name was mandatory in some Ensemble versions. When I was actively working on a project I was testing it against Ensemble and Cache 2018 or so. Some "magic" things happen there, and it's good to have a few test instances installed when you fix core features. Literally, in that case, WebSocket wouldn't work if you don't use the full classname in the URL! I know it puts more work, but given these are installed should take just around 10 minutes to validate and potentially save hours or days for WebTerminal users.

Thanks a ton for your contributions!