Slightly more extensible multi-cell segmentation support.

src/MATLAB/+Dev/CompileLEVer.m

src/MATLAB/+Load/GetCellTypeParameters.m

src/MATLAB/+Load/GetSupportedCellTypes.m

src/MATLAB/+Load/InitializeConstants.m

src/MATLAB/+Load/QueryCellType.m

src/MATLAB/+Segmentation/AdultFrameSegmentor.m

src/MATLAB/+Segmentation/EmbryonicFrameSegmentor.m

src/MATLAB/+Segmentation/FrameSegmentor.m

src/MATLAB/+Segmentation/SegAndTrack.m

src/MATLAB/+Segmentation/SegAndTrackDataset.m

src/MATLAB/+UI/DrawCells.m

src/MATLAB/Segmentor.m