add basic csound output

[felixroos]

usage example:

note("c3").csound("<Organ1 Organ2>")

you can also define a custom instrument like this:

await csound`
instr CoolSynth
    iduration = p3
    ifreq = p4
    igain = p5
    ioct = octcps(ifreq)

    kpwm = oscili(.05, 8)
    asig = vco2(igain, ifreq, 4, .5 + kpwm)
    asig += vco2(igain, ifreq * 2)

    idepth = 2
    acut = transegr:a(0, .005, 0, idepth, .06, -4.2, 0.001, .01, -4.2, 0) ; filter envelope
    asig = zdf_2pole(asig, cpsoct(ioct + acut + 2), 0.5)

    iattack = .01
    isustain = .5
    idecay = .1
    irelease = .1
    asig *= linsegr:a(0, iattack, 1, idecay, isustain, iduration, isustain, irelease, 0)
    
    out(asig, asig)
endin`

note("c3").csound('CoolSynth')

update: now also added loadOrc to be able to load a .orc from a url. example:

// livecode.orc by Steven Yi
await loadOrc('github:kunstmusik/csound-live-code/master/livecode.orc')
note("c4").csound('FM1') // FM1 is defined in livecode.orc

[felixroos]

I think this is ready for merge. The integrations is not yet complete, as control values have to be wired up by hand (if needed), but it should be a good state for further experimentation + something to gather feedback from csounders. also, the synths sound so much better than stock waveforms :)