add klayout package

[proppy]

Upstream: https://github.com/KLayout/klayout
Build recipe: https://github.com/KLayout/klayout#building-without-qt-binding, possibly even without qt with https://github.com/KLayout/klayout/blob/master/build.sh#L93
Dependencies: qt, python, ruby, libcurl, libexpat (but it looks like most of them can be swapped out https://github.com/KLayout/klayout/blob/master/build.sh#L470)

[mithro]

@proppy - We should try and get KLayout here ASAP...

[proppy]

There is already a package available in the flaport channel maintained by the photonics community (friends of @joamatab):

conda install -c flaport klayout-gui

The python version https://www.klayout.org/klayout-pypi/ should be able to do perform GDS parsing/streaming (and maybe DRC checks? and even offscreen visualization in the future: see KLayout/klayout#1082 (comment)) and is already available on PyPi:
https://pypi.org/project/klayout/

As discussed in flaport/condalayout#1 and #193 (comment), I'd be good to co-maintain with @flaport a full featured gui version in conda-forge and have the conda-eda version mirror the version available in PyPI.

[umarcor]

@proppy @joamatab is klayout-pypi expected to be used/installed along with the regular KLayout? Or is it a subset to be used standalone?

Context: I'm considering whether to add it to container klayout (https://github.com/hdl/containers/blob/main/debian-bullseye/klayout.dockerfile) or to create a separated container for it.

[proppy]

It's a subset only implementing the Python API.