split Test/Unit coording to kernel subdirectories

CMakeLists.txt

Tests/Unit/Core/FitObjectiveTest.cpp

Tests/Unit/Core/SimDataPairTest.cpp

Tests/Unit/Device/ArrayUtilsTest.cpp

Tests/Unit/Device/BeamFootprintTest.cpp

Tests/Unit/Device/BeamTest.cpp

Tests/Unit/Device/CMakeLists.txt

Tests/Unit/Device/ConstKBinAxisTest.cpp

Tests/Unit/Device/CumulativeValueTest.cpp

Tests/Unit/Device/CustomBinAxisTest.cpp

Tests/Unit/Device/DepthProbeConverterTest.cpp

Tests/Unit/Device/DetectorMaskTest.cpp

Tests/Unit/Device/FixedBinAxisTest.cpp

Tests/Unit/Device/Histogram1DTest.cpp

Tests/Unit/Device/Histogram2DTest.cpp

Tests/Unit/Device/IOReaderWriterTest.cpp

Tests/Unit/Device/IntensityDataFunctionsTest.cpp

Tests/Unit/Device/LLDataTest.cpp

Tests/Unit/Device/OffSpecularConverterTest.cpp

Tests/Unit/Device/OutputDataIteratorTest.cpp