https://code.visualstudio.com/blogs/2019/05/02/remote-development
https://code.visualstudio.com/api/advanced-topics/remote-extensions
https://code.visualstudio.com/docs/remote/containers

"Dev Containers" are apparently the most restrictive, so we should start there to find most issues. We'll definitely need to fix the openInBrowser calls to call openExternal (in a way we can still stub for testing).

Things likely to be broken in this setup:

• calls to openInBrowser
• having webdev launch browsers
• having DevTools launch browsers
• launching emulators
• running 'Open in Xcode' / 'Open in Android Studio'
• connecting to devices on the local machine

Mostly blocked by:

• Add API for forwarding arbitrary ports when running remotely (without spawning browser) microsoft/vscode#74258
• Provide an API for extensions to know when they're running "remotely" microsoft/vscode#74188