Skidl

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* Selecting part pins now looks for exact match before falling back to regex matching.
* PySpice now needs to be manually installed to perform SPICE simulations.
* SPICE simulations of subcircuits (.SUBCKT) now supported.
* Improvements/additions to the library of supported SPICE parts.

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* SPICE simulations of circuits now supported (Python 3 only).

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* Modularized code into separate files.

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* Parsing of KiCad EESchema libraries made more robust.
* DEFAULT_TOOL replaced with set_default_tool() function.
* Some code simplification by using a context manager for opening files.

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* Testing made more robust.

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* KiCad netlists are now parsed using the external package kinparse.
* Cleaned-up pylint-identified issues.
* Removed absolute file paths to libraries from tests.