Siliconcompiler

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**Major:**

* Schema: Added ability to specify environment variables on a per-tool, per-task basis.
* Schema: Added per-tool 'techmap' parameter to library schema.
* Added browser-viewable report generation to core.summary().

**Minor:**

* Schema: Added filetypes to library schema: 'def', 'gerber', 'netlist', 'model' category.
* Schema: Added 'stackup' key to library lef/gds parameters.
* Schema: Changed 'pdk' and 'stackup' library parameters to lists.
* Schema: Added 'dir' passthrough to library schema.
* Schema: Added 'nodisplay' option to schema to better support headless jobs.
* Schema: Added 'licensefile' to package parameters to support non-standard licenses.
* Schema: Added 'gerber' to read schema.
* Schema: Added several cell categories to library schema.
* Changed how PDK-specific Yosys and OpenROAD parameters are driven to avoid hardcoding process info in tool drivers.
* Fixed step ordering bug in core.summary().
* Fixed bug with how 'arg', 'index' is handled.
* Fixed small bugs in automatic documentation generation.
* Added core.check_filepaths() helper.

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**Major:**

* Schema: Added 'flow' key to flowgraph to enable multi-flow targets.
* Schema: Added 'flow' parameter to enable selection between flows in flowgraph.
* Schema: Changed '_' separated tuple target to a single 'module' load target.
* Schema: Added 'regex' for grep like functionality.
* Schema: Changed metal grid to use PDK metal name as the major key.
* Schema: Added 'tool' key to PDK settings to avoid tool file conflicts.
* Schema: Added 'units' parameter to enable tech agnostic SDC.
* Schema: Added ability to specify tricky apr setup files on a per tool basis (tracks, taps, vias, antenna, etc).
* Schema: Added checklist functionality
* Added core.grep function
* Added core.check_logfile function to core API to emulate grep behavior
* Added core.load_{target, flow, lib, pdk} functions to core API in place of target()
* Added asap7 target
* Added docker support for basic RTL2GDS tool chain
* Removed core.target() function

**Minor:**

* Schema: Changed lib 'driver' to move into cells (consistency)
* Schema: Added site symmetry to avoid full lef parser.
* Schema: Changed tool version switch to a list
* Schema: Changed 'asic', 'targetlib' to 'asic', 'logiclib' for clarity.
* Schema: Changed 'eda, 'report' parameter guideline to always use 'metric' as keyword
* Schema: Added -skip_check option to speed up new target bringup
* Schema: Added -skip_step option to enable skipping specific steps
* Schema: Added 'pdk', ['file', 'directory', 'variable'] parameters to enable tool-specific PDK setups.
* Schema: Changed cell types to be hardcoded (tapcell, buf, clkbuf, etc) to avoid fragmentation.

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**Minor:**

* Fix bug in Yosys parameter requirements spec that made check_manifest() too strict

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**Major:**

* Schema: Add 'tool' key to PDK fields
* Schema: Remove unneeded 'record' keys
* Implement automatic record-keeping
* Implement checks that flow make sense in terms of file I/O and that required files resolve
* Allow importing multiple files with the same basename

**Minor:**

* Automatically configure KLayout path on macOS
* Allow importing multiple files with the same basename
* Implement -I CLI switch for include directory

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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