point inside nonconvex polygon algo
add tests point inside nonconvex contour
use CG_COLLINEAR & CG_LEFT instead of ints
use orientation_t type instead of int
added quick hull algorithm
added tests for quick_hull algorithm
added quick_hull in visualization
now some parameters are passed by reference, not by value
Pulled point inside nonconvex contour algorithm and tests
fixed bug in quick hull
added test for quick hull algorithm
Pulled quick_hull