builds with new ugens
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take Optional out of the ugen line. then again, clean up package, and use Optional in the buffer etc. classes
again moving to ugen package - this time Env. not sure I like this. ... ?
compiles again. rename Slope to Curve because stupidly there is ugen that goes by that name
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back to 2.10.0 (SI-7268 or SI-7436 not fixed before 2.10.2 :-( )
v1.8.0. (fix examples, update readme and changes)