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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'

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

Co-Authored-by: Alexis Girault <alexis.girault@kitware.com>

Mistakes following the addition of more ExternalData from merged PR:
!135

CDash: http://my.cdash.org/viewBuildError.php?buildid=1143408

* Add data needed for the examples inside Sandbox
    except ETI & textures
* Remove condition on DATA_ROOT_PATH since the user doesn't have to specify it
* Rename DATA_ROOT_PATH to iMSTK_DATA_ROOT according to 267b7f72

Can directly used to create visual objects.

Also use unordered_map in SimulationManager.

Uses a dummy implementation of imstkScene to test
a module execution in multithreading.

Adding project name (iMSTK)

Skeleton of CMake architecture and of first few classes.