Siliconcompiler

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**Major:**

* Added slang tool with a lint task.

**Minor:**

* Corrected reading of previous run manifests to avoid loading manifests of nodes while will need to be rerun.

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**Major:**

* Overhaul of Chip and Schema python APIs.

* Major Chip function changes: renamed `register_package_source` -> `register_source` and `_getworkdir` -> `getworkdir`.
* Major Schema function changes: renamed `_has_field` -> `has_field`, `_remove` -> `remove`, and `_is_empty` -> `is_empty`.

* Overhaul of Schema keys to clean unused keys and keys with overlapping purposes, major changes:

* Added metrics: drcs, setupskew, holdskew, and inverters.
* Removed the unit section of the Schema.
* Renamed ['option', 'cache'] -> ['option', 'cachedir'].
* Merged behavior of ['option', 'flowcontinue'] and ['option', 'continue'] into ['option', 'continue'].
* Removed ['option', 'relax'], ['option', 'trace'], ['option', 'skipall'], and ['option', 'skipchecks'].

* Add ability for job scheduler to send status update emails via ['option', 'scheduler', 'msgcontact'] and ['option', 'scheduler', 'msgevent'].
* Make resume the default behavior for runs, when a new run is needed ['option', 'clean'] can be set to True to delete the old run and start fresh.
* Add capability to copy an old run and resume from a specific node, allowing users to preserve the original run while avoiding rerunning previous steps.

**Minor:**

* Add option to `write_flowgraph` to add file annotations to graphs.

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**Major:**

* Add support for docker based running through the use of the ['option', 'scheduler', 'name'] = 'docker'.

**Minor:**

* Ensure that exceptions are printed to log when they occur during runs.
* Added timestamp checking to resume checks when file hashes are not available.
* Implemented totaltime metric to track the total execution time of a run.

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**Minor:**

* Expended daily CI testing to include all examples.
* Cleaned up python requirements to remove unused ones.
* Added `verbose` and `require_reports` flags to `check_checklists` to allow for better control of checklist checking.

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**Minor:**

* Limit logging while generating testcases during run.
* Move sc-leflib to test requirements

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**Major:**
* Fixed accounting for resources in scheduler.
* Removed limitation that prevents slurm from being the first node in the execution graph.
* Added capability to generate standalone testcases on failures to make issue reporting easier.

**Minor:**

* Print stacktraces in logger to allow for better tracking of errors.

* Tools:

* opensta: fixed thread handling in tool driver and added a library reporting task to collect information about timing libraries.
* openroad: correct image collecting to avoid generating IR drop on every task.
* slurm: provide clear error message when slurm is not installed.
* surelog: correct top module handling in systemverilog mode.