[ctioga2] be more resistant to unescaped % in texts
[ctioga2] pave the way for arbitrary fill patterns
[ctioga2] utility class to find intersections between lines
[ctioga2] patterned fills with arbitrary slanted lines
[ctioga2] crossed fill patterns
[ctioga2] fill pattern curve style
[ctioga2] tests for patterned fills
[ctioga2] fix angle for non-unity aspect ratios