Refactoring proposal

[oslego]

Hi Daniel,

Thank you for building doppler!

It's one of the projects that have inspired me to go speak at a conference about unconventional ways to transmit data and input. I will use doppler on stage, of course giving due credit to you and the paper authors.

I made some updates to a fork of the project, mainly to suit my needs during an interactive demo on stage. The changes introduce the ability to turn doppler on/off, update API references and expose callbacks. I'd like to contribute my changes back to the main project, but I batched them together in one "refactoring" branch rather than multiple atomic commits.

Please have a look at the diff and the comments at the end.

Are you open to accepting this batch of changes as a pull request?

They do introduce breaking changes for existing demos, but I'm willing to help update them (I replaced init(callback) with start() and on('sample', callback)).

[SMUsamaShah]

@SidBlack this isn't your project.