Fix #319 keep unknown files when importing and downloading a project

src/app/contexts/Project.tsx

@@ -13,6 +13,7 @@ export type Project = {
 	namespace?: string,
 	version?: VersionId,
 	files: ProjectFile[],
+	unknownFiles?: UnknownFile[],
 }
 export const DRAFT_PROJECT: Project = {
 	name: 'Drafts',
@@ -26,6 +27,11 @@ export type ProjectFile = {
 	data: any,
 }
 
+export type UnknownFile = {
+	path: string,
+	data: string,
+}
+
 export const FilePatterns = [
 	'worldgen/[a-z_]+',
 	'tags/worldgen/[a-z_]+',