update types ns decl
refactor triangle ns ORG structure, remove line ns dependency, re-add PMeshConvert impls
add PCenter impl for Plane type
add infinite Vec2/3 constants
update thi.ng/common dep to 0.2.0-SNAPSHOT
add dummy PVolume impls for line types
add more protocol impls for Plane, bugfix intersect impl for new line types, rename plane-with-p ctor
minor update of rect/classify-point