[feat] Save pattern data

[tildebyte]

I know that we're in that realm of "happy accident", and we have MIDI out to capture sequences in case something really nice pops out, but it'd be kind of cool to be able to save and load the whole "deck" as a preset.

[millxing]

Agreed, that would be cool.

I like to use copy/paste to store a nice sequence, but you can only store one sequence at a time.