Explore what it takes to ship VS Code as a UWP application

[bpasero]

Goals:

• what does it take to convert VS Code to UWP
• what are issues we see when running Code from the store

/cc @kieferrm @egamma @seanmcbreen @chrisdias

[bpasero]

Needs a proper done criteria. Also no longer seems to be on the January plan.