support midi sysex messages

[artfwo]

this requires an additional event type for sysex events.

[dndrks]

@tehn , this came up on lines today -- should we consider reopening? https://llllllll.co/t/how-do-i-send-midi-sysex-messages-on-norns/34359

[dndrks]

oh damn, @catfact solved it. sorry for the noise!

you just send the bytes.

midi_out.send(0xf0) -- sysex start
--- send sysex bytes...
midi_out.send(0xf7) -- sysex end

if anything is “missing”, it is that Midi.to_data() function doesn’t include entires for “systex_start” and “sysex_end”, which contstitutes the entirety of the “MIDI standard for sysex.”

[catfact]

my proposal needs testing, but that's all sysex is - those two bytes with stuff in between.

it could still have an event type that sandwiches an arbitrary byte table between start and end. this should take about 5 minutes to add.