crow 3.0 prep + ^^dual: JS rewrite

to prepare for crow 3.0, three devices have been touched up:
- ^^ins: change polling speed for more reliable translation
- ^^outs: remove 'lfo', which is totally fine because 'remote' can be mapped to Live's native LFO device
- ^^dual: remove 'n2v' conversions, which have been deprecated

as an exercise in legibility, I also rewrote the logic of ^^dual in a [js] container, so that there are less Max-specific workarounds like 'sprint symout' with its concat placeholders. this didn't result in *less* text, by any means, but there are some clear cause-and-effect relationships now that will hopefully encourage others to approach building/hacking new crow M4L devices