[Bf-python] Applying an Object matrix using mathutils.

[Campbell Barton]

Im just writing because I think there must be a better way to apply an 
object matrix when exporting vert positions.

The problem is that I cant use Mathutils because a vector is a [3] 
length vector and an object matrix is 4x4.

I have used the function below, mabe It can be done in mathutils, or an 
extra function that replaces this could be added to mathutils.
- Cam


#==================#
# Apply Transform  #
#==================#
def apply_transform(vert, matrix):
   x, y, z = vert
   xloc, yloc, zloc = matrix[3][0], matrix[3][1], matrix[3][2]
   xcomponent = x*matrix[0][0] + y*matrix[1][0] + z*matrix[2][0] + xloc
   ycomponent = x*matrix[0][1] + y*matrix[1][1] + z*matrix[2][1] + yloc
   zcomponent = x*matrix[0][2] + y*matrix[1][2] + z*matrix[2][2] + zloc
   
   return [xcomponent, ycomponent, zcomponent]