add type_vec4
implement __init__
add TODO for __init__
implement operators
implement operators
implement operators
implement rgba and stpq attributes
implement type conversion function
implement swizzle
reimplement list and tuple initialization
add type_vec4 test
add swizzle test for vec4
index set fucntion no reture type
add list like get and set test
add more error test
add type_mat4x4.py
implement __init__
implement compute_inverse
implement binary operators
implement more operators