Matrix3f and Matrix4f have inconsistency

[menackni]

Hi.

While in Matrix3f variables are public, in Matrix4f they have no modifiers so i cannot access it directly from another class.

Matrix3f: public float m00, m01, m02;

Matrix4f: float m00, m01, m02, m03;

[httpdigest]

You hardly would ever need to access the individual matrix elements. And if you do need it, you can use the accessor methods (m00() instead if m00).

[httpdigest]

Duplicate of #324, #167, #156, #130