Improve behavior over non-https connection

[isc-tleavitt]

Without this, VSCode webviews just won't work. (And they fail badly.)

Could also perhaps make this clearer in the settings / git webui pages themselves. Specifically: if you attempt to access one of these pages on non-localhost over an http connection, offer a link that opens in a new window and yell at the user for not using https.

Better yet: detect menu listing over Atelier APIs with insecure connection, yell at the user right in VSCode, and automatically open in a browser window (Action=3) rather than an iframe if it's not going to work.