Rename Splitter to Mixer

[selkathguy]

I suggest we rename the splitter to mixer, seeing as it functions more like an additive mixer than a splitter, giving two outputs with a combination of both inputs.

What would be really awesome is the ability to click the mixer and change it's function, so that it can act as a mixer (as it does now), or in some other mode like a crossover (alternating putting track A on B and B on A), etc.

Here's why I would call this more of a mixer...

[bobingabout]

It's a multifunction device, if it was named mixer, some people might not realise it can be used to split the belt traffic.
Coming up with a good name that describes most possible functions isn't as easy as it sounds.