Rename variable tucked to kink
Make RenderTask quit after drawing
Add possibility to draw colored points in orthogonal drawings
Add test environment for L edges
Start working on the L edge implementation
Many fixes for L edge drawing:

* fix mid subtract predicate (must use s>0 vs. |s|>1 and xor vs eq)
* fix slopePositive predicate (dx for dy)
* rename factor > mid_factor
* Add branch for arc orientation (cw/ccw)
Fix some stuff in L shape drawing:

* Add missing call to abs() in slopeGreaterOne predicate
* Add kink_subtract predicate
* Sign error at kink positioning
Add comments and refactor the smooth orthogonal drawer
Add support for G typed edges
Adjust G edge test so that no edges overlap
Merge tests for L and G edges
Add tests for C edges
Fix C edge drawing for downward edges
Adjust style of C edge code to better fit the style of L/G edge code
Rename LEdgeTest to EdgeTestDrawings
Factor out some common stuff into own method in EdgeTestDrawings
Add test for straight lines for sake of completeness
regenerate octahedron drawings