Implement JS image transformations onto the song image

[bekher]

Add to web UI, modify the song PNG (or RAW if PNG->RAW conversion is too lossy) using the client's browser, send back to server for conversion back to audio.

[Kkevsterrr]

I think actually our entire stack can be migrated to nodejs...
It's basically:
.MP3 -> .wav (can be done w/ https://www.npmjs.com/package/sox)
.wav -> .raw (can also likely be done w/ sox)
.raw -> .png (can hopefully be done with jimp - https://www.npmjs.com/package/jimp)
transformations (node-png - https://www.npmjs.com/package/node-png)
and then back up... what are your thoughts? Would definitely make it faster, a lot quicker to stand up, and better integrated!

EDIT: Moving this to it's own issue