Vscode: Emmet: Support to wrap with abbreviation

[egamma]

[yisibl]

Demo and doc: http://docs.emmet.io/actions/wrap-with-abbreviation/

[egamma]

@yisibl the changes are committed please verify them in the insiders build.

[yisibl]

@egamma We should support real time preview, is so cool 👻

[jonathanphz]

What's the command to do this? Cntrl + W doesn't seem to work.

[morcegon]

Please! This is so helpful!