CVG fossil remake

CVG viewport

CVG Geo and Spiral

CVG Pic and Interbezier

Bezier perf test: OK !

Composition: 100 bezier lines sampled 100 times with random circle radius:
XRVG: ~50s
CVG: ~2s with rasterizing

C++ CVG + antigrain first generation

1M circles OK

0.1M ellipses in C++ with Antigrain

Ondulated cocoon

Cocoon reference

Crystal cocoon

Computation duration: 6H45
Line numbers: 41830