Added - color and alpha options for various primitives - line segments intersection
Debug - arcs: is_trigo and angle were sometimes false
0.1.7
Added - random vector and points - dashed line option in babylon of LineSegment3D - Measure2D - babylon_data: a dict language to describe models to be unpacked by a babylonjs unpacker
Removed - constants o2D, x2D, y2D...: use O2D, X2D...