Organized files into packages

src/MATLAB/+Helper/imgaussian.m

src/MATLAB/+Helper/immean.m

src/MATLAB/+Helper/immedian.m

src/MATLAB/+Testing/Allstats_AddConstant.m

src/MATLAB/+Testing/Allstats_AddImageWith.m

src/MATLAB/+Testing/Allstats_ApplyPolyTransformation.m

src/MATLAB/+Testing/Allstats_Gaussianfilter.m

src/MATLAB/+Testing/Allstats_Histogram.m

src/MATLAB/+Testing/Allstats_ImagePow.m

src/MATLAB/+Testing/Allstats_MaxFilterEllipsoid.m

src/MATLAB/+Testing/Allstats_MaxFilterKernel.m

src/MATLAB/+Testing/Allstats_Meanfilter.m

src/MATLAB/+Testing/Allstats_MedianFilter.m

src/MATLAB/+Testing/Allstats_MinFilterEllipsoid.m

src/MATLAB/+Testing/Allstats_MinFilterKernel.m

src/MATLAB/+Testing/Allstats_MinMax.m

src/MATLAB/+Testing/Allstats_MultiplyImage.m

src/MATLAB/+Testing/Allstats_MultiplyTwoImages.m

src/MATLAB/+Testing/Allstats_NormalizedHistogram.m

src/MATLAB/+Testing/Allstats_OtsuThresholdFilter.m