Viewing a video attached to an incident that doesn't have an in-browser player UI prevents user from returning to incident chat

[fabacab]

We need to manually check the video media types to see if the wp_video_shortcode() can generate a player for us. If not, we need to create a player ourselves.

This is because iOS devices using Buoy as in webapp-capable mode will not be able to return back to the incident chat screen after viewing a video directly. (They need a video players UI embedded in the browser.) This requires the user to exit Buoy, then re-launch it, in order to return to their incident chat room.

[fabacab]

This also happens to the images, by the way, because they are directly linked. We need some other UI for this.