Quaternions for OpenScad

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Adding Quaternion support to OpenScad, this plugin streamlines rotations by simplifying the process with the 'quat' function. To perform a 30-degree rotation around the z-axis, use 'rotz = quat([0,0,1], 30);'. Convert the quaternion to a matrix using 'rotzmatrix = quat_to_mat4(rotz);', which can be applied with 'multmatrix()'. Combine multiple rotations by creating separate quaternions and multiplying them together. The library also includes additional functions for different vector sizes and improved column major ordering in the 'mat4' routines. Recent updates include additional routines like 'quat_conj()', 'quat_distance()', 'quat_norm()', and 'quat_normalize()'. A user-friendly test file, test_maths.scad, is also available for experimentation. Embrace this plugin for simplified rotations in OpenScad!