sleroux/rainy-morph: Vector path morphing lib for RainyNite.

caryoscelus 50443cc86a BezierKnots: add default implicit ctor		%!s(int64=7) %!d(string=hai) anos
..
compare.h	2627c29dc4 CMake scripts, geom_helpers, conversion test	%!s(int64=7) %!d(string=hai) anos
knots.h	50443cc86a BezierKnots: add default implicit ctor	%!s(int64=7) %!d(string=hai) anos
knots_io.h	8a6680ccc8 Minor change in knots_io	%!s(int64=7) %!d(string=hai) anos
point_io.h	d489967306 Point io: switch to operator<< provided by 2geom for now	%!s(int64=7) %!d(string=hai) anos
split.h	02e9a1d6bb Prepare average: simple cases	%!s(int64=7) %!d(string=hai) anos