re-frame component

[danielcompton]

@kennethkalmer from https://gist.github.com/kennethkalmer/e74794f7b8f6e3a695a1ddabfc38f2e3 is examining how we can provide a re-framy interface to s3-beam.

[kennethkalmer]

#nopressure

I'm busy testing an :upload-file effect, which I hope makes things simpler from the caller's point of view. Also means removing "global" :upload/* event handlers... So far so good 🤞