Split large files into multiple data URLs

[SheepTester]

https://scratch.mit.edu/users/Sheep_maker/#comments-152904962

Currently this error occurs because the data URL-ifier can't really handle large Blobs

I think I attempted to fix this in https://github.com/SheepTester/htmlifier/tree/large-file-slices. To avoid the string limit, I'll have to split the string into chunks and them pass them separately to the Blob constructor