added quality menu to menubar with code to count edge crossings
implemented method that counts number of bends
implemented bend promotion to take bends into account while counting crossings
implemented angular resolution metric + scaled angular and crossings metrics to lie between 0 and 1
bend metric geschaald naar tussen 0 en 1
implemented and tested method to mirror object about line
hoek tussen edges berekenen verplaatst naar mxGeometricUtils
onafgewerkte versie van symmetry metric: convex hull area moet nog berekend worden
implemented and tested methods for calculating convex hull of set of points and calculating area of a convex polygon
implemented symmetry metric
implemented metric for edge length uniformity
implemented edge orthgonality metric
implemented metric to assess how uniformly vertices are distributed in the graph.
implemented node edge distance metric