Share structured data types in export

Place shared types of the export functionality into lib and use in the
web interface to make sure the data is not incorrectly handled.

Resolves #526

packages/controller/src/routes.ts

@@ -246,7 +246,7 @@ async function uploadExport(req: Request, res: Response) {
 	];
 
 	let assets: any = {};
-	let settingPrototypes = {};
+	let settingPrototypes: lib.ExportSettings = {};
 	for (let filePath of exportFiles) {
 		let file = zip.file(filePath);
 		if (!file) {