mathutils rotate functions for Euler/Quaternion/Matrix/Vector types.

each accept Euler/Quaternion/Matrix types.

eg:
  Euler.rotate(Quaternion(axis, angle))
  Vector.rotate(Euler((pi/2, 0, 0)))

matrix.resize_4x4() and euler.make_compatible() were still returning an instance of themselves, now return None.

source/blender/python/generic/mathutils_matrix.h

@@ -55,4 +55,6 @@ PyObject *newMatrixObject_cb(PyObject *user, int rowSize, int colSize, int cb_ty
 extern int mathutils_matrix_vector_cb_index;
 extern struct Mathutils_Callback mathutils_matrix_vector_cb;
 
+void matrix_as_3x3(float mat[3][3], MatrixObject *self);
+
 #endif /* MATHUTILS_MATRIX_H */