Extension host (#20)

* Implement net.Server

* Move Socket class into Client

This way we don't need to expose anything.

* Remove some unused imports

* Pass environment variables to bootstrap fork

* Add debug log for when socket disconnects from server

* Use VSCODE_ALLOW_IO for shared process only

* Extension host can send messages now

* Support callback for logging

This lets us do potentially expensive operations which will only be
performed if the log level is sufficiently low.

* Stop extension host from committing suicide

* Blank line

* Add static serve (#21)

* Add extension URLs

* how did i remove this

* Fix writing an empty string

* Implement dialogs on window service

packages/vscode/webpack.config.bootstrap.js

@@ -64,6 +64,7 @@ module.exports = (env) => {
 				"windows-process-tree": path.resolve(fills, "empty.ts"),
 
 				"electron": path.join(vscodeFills, "stdioElectron.ts"),
+				"native-watchdog": path.join(vscodeFills, "native-watchdog.ts"),
 				"vs/platform/node/product": path.resolve(vscodeFills, "product.ts"),
 				"vs/platform/node/package": path.resolve(vscodeFills, "package.ts"),
 				"vs/base/node/paths": path.resolve(vscodeFills, "paths.ts"),