better living through list comprehension: performance tweak on opc.py

- Remove MIDI inputs that only make sense on the Q49 keyboard
- Expire particles with zero intensity, and cap the max particles
- Lower particle generation rate

Adding Perl OPC module and examples

Switched to building fcserver in a 10.6 VM

I wrote this before FC had gamma correction, I think?

This changes the doFrame() API!

LWS wasn't giving us the usual connection closed callbacks due to our early hijack of the connection. Instead, delete the buffer when we unregister the client's poll FD.

resolves #28

Helps with testing effects in fast/slow motion