Zyc

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* Disabled creation of SKiDL logging and ERC files.
* Decided this tool was mature to the point it could be called 1.0.0.

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* Fixed infinite recursion caused by search that returns an entire list of invalid footprints (issue 2).

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* Fixed copy-paste part/footprint errors caused by clipboard already being open.

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* Replaced sorting function deleted from SKiDL.
* Updated some Grid definitions for wxpython 4.0.

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* Extracted zyc utility from SKiDL repo and released separately on PyPi.