clean up
keep up with scalacollider changes. add serialization suite for synth graph
...
synth graph serialization with reference memoization
performance comparison with POJO serialization. approx 1/4 of space, mostly much faster write, but somehow slower read (2x), which might be due to finding the `apply` method instead of running the constructor? good enough. will comment out perf test after this
bump once again into SI-7481
v1.8.0