Was not passed to external projects

The following warning on Linux and Windows triggers an error on Mac:

'''
imstkTetrahedralMesh.cpp:151: error:
non-constant-expression cannot be narrowed from type 'int' to 'value_type'
(aka 'unsigned long') in initializer list [-Wc++11-narrowing]
surfaceTri.push_back(triArray{ { a, b, c } });
                                 ^  ^  ^
'''

Fixed by using size_t where needed.

LibNiFalcon is an external project dependency on every system.

On Mac and Linux, libusb1 would be found
with other names.

Needed for VRPN. Use fork made for cmake improvements
and plan for a pull request:
https://github.com/agirault/libnifalcon/tree/improve-cmake

Could not link against hidapi on windows (setupapi)

Not sure about the need for libusb1 on windows.

Comments added to FindVRPN to analyze what is happening.

1) Only output to CMAKE_XXX_OUTPUT_DIRECTORY without
worrying about CMAKE_CONFIGURATION_TYPES

2) Use CMAKE_CFG_INTDIR to correctly set CMAKE_LIBRARY_PATH
after the change 1)

3) Use mark_as_superbuild() to pass variables to external
projects and innerbuild. (${PROJECT_NAME}_EP_ARGS)

4) Remove unecessary steps in eigen project (only includes, no lib)

5) Use standard imstkAddExternalProject for Uncrustify (not tested)

Needed VTK for mesh reader

1) Get rid of type in deviceClient
2) Rename URL to IP in deviceClient
3) Add machine (name or ip) and port number as parameters
in device server to be able to create external servers
4) Refactor VRPNDeviceServer::addDeviceClient into addDevice
to use only a deviceName and a deviceType

In release, the empty while loop were stuck. Making
m_status volatile would fix the issue, but here we
are dealing with a variable handled by multiple threads,
so making it atomic makes the most sense.

Geometry sprint



See merge request !80

Was removed in 33a65d44. Now wraps extractSurfaceMesh.

Removes lambda to inline the uniqueness check for performance.

Modifies surface extraction algorithm to search for unique triangle faces instead of O(N^2) search over tetrahedra.
It still takes longer in debug mode.

TODO: Explore faster ways to do the extraction.

Makes extract surface functionality as utility as utility instead
of hardwiring to extract the attached surface mesh.

A surfaceMesh will not be automatically extracted when
reading a volumetricMesh due to the long time necessary
for that process, which will be improved later on.
(vtkDatasetSurfaceFilter is 100x faster)

The user will have to call computeAttachedSurfaceMesh to
extract the surface mesh from its volumetricMesh if he
needs it.

The way its done the outer loop will not be traversed fully all the time. Fixes this bug in surface mesh extraction function.

Also implemented MappedVertexArray to map out structure
vertices to polydata points directly (no copy).

1) Only update the renderWindow in setRenderingMode if
the viewer is up and running

2) Do not set a renderMode when setting a new current
scene if the viewer is not yet rendering.

reads polydata and unstructured grid meshes

1) Clean up print methods
2) Put initialize, print, clear, getVolume on top
3) Add missing overrides
4) Replace extractSurfaceMesh by computeAttachedSurfaceMesh
5) Define Mesh::print
6) Use Mesh::clear in subclasses

Adds optimizer to the mesh. This algorithm rewires
the node order and triangle connectivity to optimize
for memory layout. Adds tests for the same.

The algorithm starts with a random node and flood-fills
in the triangular mesh space adds nodes and elements
at every iteration. The iteration ends when the surface
is "flooded". The algorithm assumes that the mesh is
one topologically connected entity.

TODO: Further optimization at each iteration. Extend to other mesh types.

Adds a function to check if a geometry is a mesh.
Adds printing to geometry class
Stylistic changes in extract mesh class

Fixes bugs and tests surface extraction.
Fixes bugs and tests one to one nodal map.

Adds comments to the classes and their functions in geometry module

Adds surface mesh extraction from tetrahedral mesh
TODO: code style check and test

Adds one to one nodal map between two meshes. There are compute and set options for the map.

1) readAsAbstractPolyData completed
2) readAsGenericFormatData still ongoing
3) implemented standard createSurfaceMesh in MeshReader