Set default values for mod settings on export

Add missing mod settings set to their default values to a mod pack when
performing a data export based on the settings prototypes that were
extracted from the game. This mirrors the behaviour of Factorio when new
setting prototypes are added by a mod.

packages/master/src/routes.js

@@ -220,12 +220,17 @@ async function uploadExport(req, res) {
 	];
 
 	let assets = {};
+	let settingPrototypes = {};
 	for (let filePath of exportFiles) {
 		let file = zip.file(filePath);
 		if (!file) {
 			continue;
 		}
 
+		if (filePath === "export/settings.json") {
+			settingPrototypes = JSON.parse(await file.async("text"));
+		}
+
 		let { name, ext } = path.posix.parse(filePath);
 		let hash = await libHash.hashStream(file.nodeStream());
 		assets[name] = `${name}.${hash}${ext}`;
@@ -233,6 +238,7 @@ async function uploadExport(req, res) {
 	}
 
 	modPack.exportManifest = new libData.ExportManifest({ assets });
+	modPack.fillDefaultSettings(settingPrototypes, logger);
 	res.app.locals.master.modPackUpdated(modPack);
 
 	res.sendStatus(200);