More Robust Wrapper and Padding mixins

[evanmwillhite]

Problem description: Based on multiple project experiences, it seems like we should maybe look into making the wrapper/padding mixins more robust. Also, possibly decide on a specific approach for wrapper and full screen functionality (or similar to grid/flex have one of the approaches used by default and the other commented out)

Suggested solution:

• Possibly multiple mixins (outer and inner, e.g.)
• Possibly multiple approaches (or decide on one) expressed in the code
• Simpler is better. Smaller, simpler mixins would likely be better than one giant one with lots of args