Fix issues with configuration directories

- Move the old data directory if possible.
- Fix extension path to not use a hard-coded path and instead use the
  data directory.
- Create every part of the path during startup.
- Create each path when a connection is made as well in case they are
  deleted while the server is running.
- Create every part of the path before saving settings or writing a file
  using the resource endpoint.

packages/vscode/src/fill/environmentService.ts

@@ -1,3 +1,4 @@
+import * as path from "path";
 import * as paths from "./paths";
 import * as environment from "vs/platform/environment/node/environmentService";
 
@@ -5,6 +6,10 @@ export class EnvironmentService extends environment.EnvironmentService {
 	public get sharedIPCHandle(): string {
 		return paths.getSocketPath() || super.sharedIPCHandle;
 	}
+
+	public get extensionsPath(): string {
+		return path.join(paths.getAppDataPath(), "extensions");
+	}
 }
 
 const target = environment as typeof environment;