tuned ray-triangle intersection, now there are three algorithms to choose from: Plucker, Barycentric and Barycentric with preprocessing (Wald) methods in Vector and Shape (and derivates) made const

demos/ModulePath
demos/*.png
demos/kdtree.obj
ccdemos/*.png
ccdemos/spheres_shadow
ccdemos/realtime
ccdemos/realtime_dragon
models/bunny
models/happy
models/dragon
bin/*