Migrate away from Chrome App

[xopr]

The Chrome Apps (FlutLogo UDP connector app, FlutArt and ColorFlut) cannot be used anymore in the future.

There is currently no UDP support; it probably needs to use Node/Python connector app that does native messaging.

See:

• https://developer.chrome.com/docs/extensions/reference/sockets_udp/
• https://blog.chromium.org/2021/10/extending-chrome-app-support-on-chrome.html
• https://wicg.github.io/direct-sockets/
• https://chromestatus.com/feature/6398297361088512

Native messaging:

• https://developer.chrome.com/docs/apps/nativeMessaging/
• https://github.com/jdiamond/chrome-native-messaging
• https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging#app_side