Implement a fully functional pure kotlin Matrix implementation, such that all ops (e.g. decompositions) are available on all platforms.

[kyonifer]

The current DefaultXXMatrix implementations currently have a lot of unimplemented methods. On some platforms (e.g. js-in-browser) finding an apache license compatible lib that has the full set of functionality can be challenging, so it would be useful to have a set of complete default implementations for full compatibility.