Remove many lint warnings
Mostly whitespace changes, with max-line-length set to 120 and double-quotes used, adopting black settings. Related to https://github.com/capnproto/pycapnp/issues/128
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Mostly whitespace changes, with max-line-length set to 120 and double-quotes used, adopting black settings. Related to https://github.com/capnproto/pycapnp/issues/128