#81
adds gui to the CloseStep class #80

Signed-off-by: mrzl <marzzzel@gmail.com>
adds GUi to the GaussianBlurStep #80

Signed-off-by: mrzl <marzzzel@gmail.com>
adds a ThresholdStep class incl. GUI #80

Signed-off-by: mrzl <marzzzel@gmail.com>
adds the ThresholdStep to the main ProcessingPipeline Gui

Signed-off-by: mrzl <marzzzel@gmail.com>