Added demo loading and other things to the backend

Author: rmburg

.gitattributes

@@ -6,3 +6,4 @@
 *.icns  binary
 *.gif   binary
 *.xcf   binary
+*.dem   binary

package-lock.json

@@ -16,6 +16,7 @@
     "@tauri-apps/api": "^1.0.2",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
+    "tauri-plugin-log-api": "github:tauri-apps/tauri-plugin-log#dev",
     "tauri-plugin-store-api": "github:tauri-apps/tauri-plugin-store#dev"
   },
   "devDependencies": {