Object library package for handling object image pre-processing
Basic thresholding on single test image passed as argument
Renamed visiontest, added simple thresholding test with slider
Basic contour-based extraction of object from single image
First version of the image extraction.

Assumes a certain directory structure. The directory passed as input
should contain directories which contain images of the objects.

Extracted images will be output with the same directory structure to the
second input parameter.
Added support for single directory processing

Added some utility functions to reduce code reuse.
Making full use of custom struct instead of populating map
Moved directory processing to utility library