Flesh out angle-axis and create buttons for updating master

I fleshed out the angle-axis representation and got everything hooked up between matrix, quaternion, and angle-axis. The masterParams are now displayed separately, just for debugging.

The problem with rotation representations is that the values within a given representation are inherently constrained, which means in some sense you don't want to actually call an update while you are still entering values. So, I added buttons to explicitly call the update. We can remove the buttons later and make the 2-way binding automatic if it makes sense to do so.

Nothing too earth-shattering here, but if you have any comments on style or other bits I should learn from, feel free to share :)