Switch to use standard @types/node types instead of our customized version

Using a custom version of the node typings is causing a lot of pain while trying to upgrade our build to use `@types` instead of the `d.ts` files we have to maintain. I believe we primarily maintain our own version for two reason:

- Custom require function
- setTimeout and other timer functions return NodeJs.timer instead of a number

These can both be delt with, the first by using interface augmentation and the second by switching to use any types for timer. I believe that the pain of maintaining our own node `d.ts` outweighs the benefits here

This change switches us to use the standard @types/node package for our node typings

src/vs/workbench/api/electron-browser/mainThreadDocuments.ts

@@ -36,7 +36,7 @@ export class BoundModelReferenceCollection {
 
 	add(ref: IReference<ITextEditorModel>): void {
 		let length = ref.object.textEditorModel.getValueLength();
-		let handle: number;
+		let handle: any;
 		let entry: { length: number, dispose(): void };
 		const dispose = () => {
 			let idx = this._data.indexOf(entry);