Add audio testing examples in sandbox. Add resources to the data folder

The reset doesn't work for NeoHookean PBD constraints but works
for other types of constraints. This is added to issue tracker.

Using StVK type FEM constraint in PBDVolume() example

Some format enforcements by Uncrustify

1. Enables correct winding of the surface
triangles of the surface mesh extracted from the
tetrahedral mesh
2. Adds render material for the surface mesh
3. Change the default mesh that is loaded in the sandbox example

Adds option to start the simulation manager with
the simulation either in RUNNING or PAUSED mode
and the viewer in DEBUG or SIMULATION mode.

Other changes:
1. enforce const correctness
2. add comments to the member functions
3. add overload function to retrieve scene manager by scene object
4. rename 'current' scene to 'active' scene

Mesh class is renamed to PointSet since
the word 'mesh' implies that connectivity
information is part of the class which is
not the case

Adds background color option to VTKViewer class which
internally calls vtkRenderer

Add option to enforce consistency of winding of resulting surface mesh in the extractSurfaceMesh function

Move the main() to the end of the file

In the PbdConstantDensityConstraint class:
1. Style changes
2. Remove unused functions
3. Remove casting warnings
4. Add get set functions for density and max. neighbor distance
5. Add comments for variables and functions
6. Remove grid based neighbor search functions

Enforces license header and the rest of configuration options. To enable it,
manually run SetupForDevelopment.sh and enable uncrustify during configure.
Also provided is default configuration file to be consulted when a new
option is needed. This file has explanations for all the options.

Also, some source code files have been modified to prevent ugly auto-reformatting.