Vec3

Minimal vector manipulation for 3d vector, compatible with the current table system :

vec = vec3(x, y, z)

allowing basic math (addition, multiplication etc), for example :

pos = (getPosition(object) + vec3(1, 0, 0)) * 2

-- it's still a table like before :
x = pos[1]
y = pos[2]
z = pos[3]