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[nbingham1]

Description

This PR fixes many of the bugs in the cell layout engine. Cells are now 97% DRC clean and the layout engine has been prepared to support LVS. Enclosure rules are now built into the generic DRC flow, and substate materials have been pulled out of the transistor models.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• User Interface update

Checklist

• I have run the code and ensured that it works as expected.
• I have added or updated necessary documentation (if applicable).
• I have added tests that prove my changes are effective (if applicable).
• The code follows the code style of this project.
• My changes generate no new warnings or errors.