Switch player to Media Chrome + smart media element selection

[mmcc]

When we first added the direct player export, we used Mux Player for simplicity since that was our current player. However, it's kind of a weird fit given the ability to add non-Mux sources via other providers.

We've got an opportunity to do interesting stuff there between Media Chrome, Player.style, and smart selection of Media Element based on what's provided.

i.e., it an mp4 is provided, just use MC + the video tag, but if a DASH src is used, use the MC + dash-player, etc.