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/protocol/src/browser/modules/fs.ts

@@ -358,9 +358,9 @@ export class FS {
 			return util.promisify(fs.read)(fd, buffer, 0, length, position).then((resp) => {
 				return {
 					bytesRead: resp.bytesRead,
-					content: buffer.toString("utf8"),
+					content: (resp.bytesRead < buffer.length ? buffer.slice(0, resp.bytesRead) : buffer).toString("utf8"),
 				};
-			}):
+			});
 		}, fd, length, position).then((resp) => {
 			const newBuf = Buffer.from(resp.content, "utf8");
 			buffer.set(newBuf, offset);