Nearly got the new serialisation format complete. Its self serializing and its forking fast!

The new foundations have less coupling to Observable. You can store files in it and read them using web APIs like fetch, XHR, dynamic imports and script tags. This is enough to boot Observable up and also to serve all its network calls in the std library locally without any modification to the 1st party source. I am considering spinning the serialisation format out as a separate project as its quite generic but I feel that would be a distraction so I will not but essentially it provides a virtual web inside a single static file. A bit like service-workers but without additional files or a webserver dependancy