Refactor and consolidate mixins

[JonnyWong16]

Description

Refactor mixins for each media type to reduce number of imports.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or updated the docstring for new or existing methods
• [ ] I have added tests when applicable