Adds memory.h for windows in cameraController to clear compiler errors

Adds close viewer window with esc button..

1) public constructor
2) add inversion flags
3) apply correct offsets and scales

still need to apply rotation offset based on
camera initial orientation

1) Camera does not hold a vtkCamera anymore (less tight integration).
It holds camera parameters.

2) Camera has a pointer to CameraController, that you can set up
based on a deviceclient. This camera controller has a reference
to the camera, and updates its parameters based on the deviceclient
retrieved information.

3) Scene runs the controller as an asynchronous module in its own
thread, it is therefore started in Scene::initModule and ended in
Scene::cleanUpModule.

4) In the timer loop of InteractorStyle, the vtk camera is updated
based on the scene camera.

5) In Renderer, a new vtk Camera needs to be created to match the
scene camera, since it is not created anymore in imstk::Camera.

1) Create a timer on the renderWindowInteractor
2) Render() in 'InteractorStyle::OnTimer()'

PR: https://github.com/libnifalcon/libnifalcon/pull/46

Based on improve-cmake that was merged:
https://github.com/libnifalcon/libnifalcon/pull/43

Did not support colors in standard output,
use std::cout and std::cerr instead.

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

Check if file exists in imstkMeshReader.