Explore dev tools server deployment

[mdittmer]

Going beyond a Chrome extension, it should be possible to deploy SMW as a service that speaks the Chrome DevTools Protocol. This would allow for more fine grained control. In particular, the service could pause script, perform checks service-side, and potentially break at the point in user's code where problems occur.

This would eliminate (in dts deployment mode, anyway) the need or hacks such as try { throw ...; } catche (errWithStackInfo) { ... } to extract source information.