v1.5.0

• SoX is no longer used in Facet. Previously SoX was a hard dependency, hence the minor version number increase.
• Audio panning now happens in the browser and can dynamically pan signals across any number of channels. So you can send multi-channel audio from the browser to a DAW or a modular synth!
• Due to SoX being removed, the saveas() method only saves monophonic wav files.
• Due to SoX being removed, the stitchdir() method has also been removed. (This command was really more of a shorthand way to run a SoX command being the scenes, and isn't worth the trouble of having SoX as a hard dependency)