Let's trim the MAX_PARAM_LEN of event to keep the ram usage down for sequencer

[bwhitman]

I was able to boot AMY on a Teensy 3.2, which has 64KB RAM. We say it needs "around 100KB" on the webpage, but I bet if you decrease AMY_OSCS to like 8 or 16 you could make it much smaller. Let's find out

[bwhitman]

back of the envelope is at 120 oscs and reverb and chorus on, on an arm64 machine, we alloc a total of 117KB.

the sizeof(synthinfo) is 437 bytes.

setting AMY_OSCS to 240, we alloc 177KB instead of 117KB. So 60KB for 120 oscillators, so 0.5 KB / oscillator.

[bwhitman]

We've grown a bit and should trim the char[255]s:

sizeof synthinfo 720 sizeof event 1256 sizeof delta 24

[bwhitman]

I also wonder if this just goes away if we port sequencer to use delta instead of event` -- that is, we parse the events into deltas and put those on the sequencer list instead of full events.