Use WABAC to replay WARCs

[machawk1]

At CNIF19, @ikreymer demoed https://github.com/webrecorder/wabac.js, which allows client-side replay using Service Workers. He and I briefly discussed WARCreate development as well.

WARCreate currently has no means of replay, just WARC creation (hooray semantics!)

Enabling replay of the produced WARCs as well as allowing WARCreate to act as the handler for WARC replay would be useful. Given a user might already have the extension installed, this would also enable further usage of WABAC and should ultimately requirement improvement of the quality of the WARCs that WARCreate...creates.

This ticket will act as a record of the idea and any prototyping efforts.