open-source-silicon.dev

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/172|#172 Add filler macros and script>
Pull request opened by <https://github.com/dnltz|dnltz>
Add filler macros from Daniel Arevalos and Krzysztof Herman. Also add a Python script to automatically fill a layout and save it.

The following example will fill all layers and generates a DRC clean layout file afterwards.

```
klayout -n sg13g2 -zz -r /home/daniel/work/elements/i2c-gpio-expander/pdks/IHP-Open-PDK/ihp-sg13g2/libs.tech/klayout//tech/scripts/filler.py \
	-rd output_file=/home/daniel/work/elements/i2c-gpio-expander/tools/OpenROAD-flow-scripts/flow/results/ihp-sg13g2/SG13G2Top/base/6_final.gds \
	/home/daniel/work/elements/i2c-gpio-expander/tools/OpenROAD-flow-scripts/flow/results/ihp-sg13g2/SG13G2Top/base/6_final.gds

```
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>
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