added intersections

.gitignore

CMakeLists.txt

src/contourize/contourize.cpp

src/intersections/intersections.cpp

src/intersections/intersections.h

src/shapes/edge.h

src/shapes/point.h

src/shapes/triangle.cpp

src/shapes/triangle.h

src/shapes/triangle_edges.cpp

src/shapes/triangle_edges.h

src/static_vector/static_vector.h

src/triangulation/triangulation.h

src/union.cpp

src/union.h

tests/simple_triangle_tests.cpp

tests/unit_tests/simple_triangle_tests.cpp