Enables the C++ SDK to be included as a submodule

This change enables the C++ SDK to be used as a git submodule and included in other CMake projects
through add_subdirectory() calls.

Change-Id: Ib02f5a3c1f0d1ae65d0f6027afe515c35c88daa3
Signed-off-by: Thomas Psota <thomas.psota@iese.fraunhofer.de>
11 files changed