Allow modules to modify JS settings for the JPlayer

Problem/Motivation

Due to analytics and tracking, we need to add a variable parameter value to the MP3 player being rendered on a node.
Doing this change through the templating system was complicated as the relationship was 2 references away.
Using view alter hooks was not possible because the JS settings were made before the view was rendered.

Proposed resolution

Add an alter hook before sending the render array that contains the JS settings.