Theme Selection / Configuration

[bmingles]

The vscode extension currently shows the default dark DH theme. We should expose a way to select / configure the theme. It would be really nice, if we could detect which default to use based on whether vscode is using light / dark theme, but at the very least, we should allow the users to explicitly set it somehow.

[dsmmcken]

Yeah, looks they have properties and events for that : https://stackoverflow.com/questions/37257911/detect-light-dark-theme-programmatically-in-visual-studio-code/70160793#70160793

[bmingles]

That's good. Will just need a way to set the theme externally in embed widget.