Siliconcompiler

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**Minor:**

* Fix sc-show on Windows.

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**Major:**

* Schema: add 'read' section.
* Schema: Add alternate frontend support.

**Minor:**

* Fix old version of Surelog bundled with wheels

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**Minor:**

* Fix: Prevent sc-show crash when PDK files are not found.
* Fix: Ensure sc-show can find KLayout executable on Windows

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**Major:**

* First public release!!!