Emmet support

[mdmoreau]

Just wondering if you were planning on adding Emmet support back to the extension. Seems like it hasn't made it into the recent updates yet. Thanks!

[ecmel]

Pull requests are welcomed.

[ecmel]

The problem is, vs code does not call this extension when emmet takes over. See microsoft/vscode#187416

[ecmel]

microsoft/vscode#168997