Non-Maxima Suppression for Oriented Bounding Boxes

Used to suppress non-maxima in the case of overlapping Oriented Bounding Boxes (OBB)

The function "nms_oriented_rectangles" can be used to merge many overlapping oriented bounding boxes into one based on a score. This method uses separating axis theorem for overlap detection.
Note: This implementation is based on the XY co-ord system, and not based on the row*column matrix indexing system of Matlab. So make sure to convert the vertices to XY co-ord system before invoking this function from MATLAB. For eg. if you are using this in image processing, the pixels of the imgae would be named by (a,b) where a is the row number and b is the column number. Convert this to XY co-ordinate system by shifting the origin.

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