Hard coded image processing parameters

[fpetric]

Image processing parameters are currently hard coded. Extract all parameters to configuration files. Add apps/scripts to set the parameters easily.

[dmiklic]

For starters, let's make a list of parameters that should be configurable:

• X/O segmentation thresholds (we have to be careful here, because red objects have two pairs of thresholds, due to the properties of HSV space)
• Hough properties?
• ???

[fpetric]

Some of Hough and Canny parameters are already configurable through imgproc_definitions.py. Thresholds for color segmentation should definitely be added.
Other parameters that are currently used are:

• relative tolerance for line merging
• radius, resolution and tolerance for intersection checking (add inner radius maybe?)