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This is an alternative to #4532.
The idea is to add a new JavaScript API
window.webxdc.replaceWebxdc
allowing the WebXDC app to replace itself. This will allow the apps to upgrade themselves by requesting a base64-encoded blob from a bot.This will also allow the apps to modify themselves by repackaging all the files with necessary modifications (e.g. updated configuration). E.g. a TiddlyWiki port may replace itself in-place instead of saving a new copy of self to chat each time.