A follow-up to #115, more extensive document.write to blob: URL rewriting when in service-worker mode:
apply rewriting even when page is still loading
passes base url along with blob id via blob:<id>/<base url> format
doesn't apply client-side html rewrite, instead relying on service-worker-side rewriting
Fixes replay issues found in replaying: https://h5p.org/presentation
A follow-up to #115, more extensive document.write to blob: URL rewriting when in service-worker mode:
blob:<id>/<base url>format