Renamed ImProc to HSP so that it matches the name Hydra Signal Processor

src/MATLAB/+Performance/MaxFilterGraph.m

src/MATLAB/+Performance/MeanFilter.m

src/MATLAB/+Performance/MeanFilterGraph.m

src/MATLAB/+Performance/MeanSpeedup.m

src/MATLAB/+Performance/MedianFilter.m

src/MATLAB/+Performance/MedianFilterGraph.m

src/MATLAB/+Performance/RunTiming.m

src/MATLAB/+Performance/StdFilter.m

src/MATLAB/+Performance/StdFilterGraph.m

src/MATLAB/+Performance/SumArray.m

src/MATLAB/template.m