Simple draw_polygon routines. Fill mode only works for convex polygons at the moment.
First attempt at OpenGL tessellation. Color blending doesn't work, but the polygon's shape/fill is definitely there.
Bugfix: weights were reporting far smaller than they should be, leaving the center of all polygons black.
Remove alpha (no other poly uses it at the moment) and added control over the winding rule.
Added a fallback option for non-tessellating systems (draws non-complex polygons only).
Merge pull request #616 from sorlok/draw_polygon

implemented draw_polygon()