Blender Git Loki

Arith:
- axis angle to quat conversion function
- short to float / float to short normals conversion function (eventually, we could go over the go and replace copy/pasted code everywhere)
- ray triangle intersection (to complement the line triangle intersection function)

View:
- viewray / viewline (get near plane point under mouse and ray normal/far point)


Particles:
- extract viewline from brush_add function