Support of prefers-reduced-data feature

[dascritch]

As an user
I want to minimize my downloads
To reduce my phone bill

There is a CSS rule for that, we can exploit it in javvascript to NOT getting even metadata and wait for a voluntary action from the user https://www.w3.org/TR/mediaqueries-5/#prefers-reduced-data

As for #180 (comment) , we can use window.matchMedia().matches

On the other side, we can sensibilize and recommend integrators about audio encoding, and also set correctly a source order https://github.com/dascritch/cpu-audio/blob/master/INSTALL.md#indicate-a-prefered-downloadable-audio-resource