Siliconcompiler

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**Major:**

* Added ['option', 'cache'] keypath to control the location of the cached data.
* Added support for Python 3.12

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**Major:**

* Added ['package', 'source', '<name>', 'path'] and ['package', 'source', '<name>', 'ref'] to support directly downloading of required data for a design, pdk, library, etc.

* Removed support for $SCPATH and ['option', 'scpath'] in favor of using package sources.

**Minor:**

* Tools:

* yosys: fixed handling of blackboxes during verilog reading, improved the sdc parsing to better estimate the clock for yosys-abc

* OpenROAD: fixed PDN file handling to only read files once to avoid errors from redefining the same grids.

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**Minor:**

* Removed unused ['flowgraph', '<graph>', '<step>', '<index>', 'valid'] field from schema.

* Tools:

* klayout: fixed DEF to GDS generation by ensuring the correct units are used during DEF read in and fixes the stream writing to honor OASIS if requested.

* OpenROAD: fixed handling of unidirectional layers in routing task and added tasks to support generating OpenRCX parasitic extraction decks.

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**Minor:**

* Added line numbers to the error and warning log files to aid in tracking down the message in the main log.

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**Minor:**

* Fixed incorrect settings when submitting remote jobs.

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**Major:**

* Deprecated support for Python 3.6 and 3.7.

* Added ['option', 'from'], ['option', 'to'], and ['option', 'prune'] to better control the execution of the flowgraph.

* Removed leflib from SilconCompiler and use the standalone implementation provided via `pip install sc-leflib`.

**Minor:**

* Moved the built in server to use the Schema class for handling its settings.

* Fixed handling of Windows paths when submitting jobs from a Windows machine to a linux runner.

* Corrected the return behavior from the schema `.get()` to ensure lists are copied instead of being returned by reference.

* Fixed behavior where `sc-show` would require both step and index to be specified and allowed for directories to be specified as the show target.

* Tools:

* yosys: Updated to support new ABC interface for passing along dont_use cells.

* verilator: added support for assertions via ['tool', 'verilator', 'task', 'compile'/'lint', 'var', 'enable_assert']