REFAC: Remove the unuecessary dependencies for imstk constraint library

See merge request iMSTK/iMSTK!354

REFAC: Move color class  to the rendering

See merge request iMSTK/iMSTK!358

Arrange the targets into respective folders

See merge request iMSTK/iMSTK!357

All example targets into 'Examples'
All the data retrieving targers into the 'Examples/Data'
All imstk libraries and uncrustify utility target into 'iMSKT'
Testing targets into 'Testing'

Octree-based Collision Detection

See merge request !349

# Conflicts:
#	Source/Collision/CollisionHandling/imstkPBDCollisionHandling.cpp

ENH: Add color to the stdout on windows

See merge request !353

ENH: Implement collision detection for point-mesh and mesh-mesh using an internal octree as a static member of the CollisionDetection class. In addition, unit tests for those collision detections were also added.

ENH: Add function to check if a collision pair has previously been added to the octree, and a function to return the number of added collision pairs

REFAC: Move imstk libraries to appropriate folders

See merge request !352

Minor clean up

See merge request !350

ENH: Small optimization for accessing colliding object (change return type smart pointer to const reference)

Refactor Geometry

See merge request !347

REFAC: Add a name field to geometry class, allowing to set a name to each geometry. This is useful during debug printing information: user can quickly identify the object in the scene.