Browser extensions

I totally love rxvision! Feels like it's been a big missing part of Rx. I've begun to try and hack this project into a chrome extension. My initial goal is just to inject and call `wrap` on window.Rx (if it exists) and display results with `viz` in a devtools panel and `trace.dump` output in the console (maybe another drawer tab). Eventually I'd like to add execution control and analysis features. I hope creating this issue thread might be a nice starting point for wider conversation around this.

The issue does not name any files, tests, or entry points. Start by reviewing the proposed Chrome extension goals: inject and call wrap on window.Rx, display viz results in a DevTools panel, and show trace.dump output in the console; completion is not defined beyond these initial goals.

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