gui_toolkit 0.87.0

Added

• push_clip_polygon takes several contours: a point past render.POLYGON_BREAK ends one, with no edge to the next: a clip with holes.
• draw.Path: lines, quadratic and cubic Bézier curves, arcs and rounded rectangles, flattened to a tolerance, filled (path_fill, nonzero or even-odd, holes included) or stroked (path_stroke, round ends and joins, even in translucent colors), with path_contains for hit tests, path_bounds, bezier_cubic_at, bezier_quad_at and draw.bezier.
• draw.line, draw.polyline: a line of any angle, with round ends and antialiased edges.

Changed

• render.release_targets takes the textures to leave: a picture still on screen stays, for the program to carry over to the new generation.