1. Enforces style to move one line code to one line
2. Move multiple lines to .cpp
3. make epsilon part of the class
4. SolvePositionConstraint in the base class is made pure virtual

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