v1.0.0: First release with new mat4 multiply order

In this version, composition a*b means "apply b, then a" for both quaternions and matrices. Before version 1.0, matrix multiply order was reversed.

v0.10.0: Last release with old mat4 multiply order

In this version, composition a*b means "apply b, then a" for quaternions and "apply a, then b" for matrices. Starting with version 1.0, mat4 multiply order will be reversed.

last release using the out-variable pattern

v1.2.9 is changing back to the old usage pattern, because writing code takes less time.

please file an issue if you need the out variable pattern's extra performance, maybe we can work something out.