1. Seperate files for separate Pbd colliison constrain classes
2. Preincrement lop variables
3. Refactor collision constraint classes: remove raw pointers, using auto, style corrections
4. Move pbd constraints to seperate folder within constraint folder
5. Clears warnings in Physics module

Style enforcement and add comments over the entire code

1) Change the interactionPair structure to save
only one collisiondata per structure, and inform
the collisionhandling of a "side" defining which
object it is handling, therefore which way it needs
to read the collisionData

2) Update MeshToMeshCD to properly populate data
based on 1.

Will be stored in each object