Connect mobile api to VAL
Move the EdX Video ID field higher up the advanced options in Studio Editing.
Simplify the code to get encoded video information from VAL.
Rework how encoded videos get into mobile API from VAL.

This reduces the number of queries related to video fetching from something
like 3*n (where n=number of videos in VAL for this course) to 1.
Course staff should be able to view courses which aren't marked mobile-ready.