Klayout DRC integration

[kareefardi]

Description

Processes/PDKs have varying methods for defining their klayout deck(s) and different ways to invoke them.

Proposal

Just some ideas:
A long term solution would be requesting a specific interface from a PDK.
A short term solution would be having an OL wrapper per PDK.

[marwaneltoukhy]

I am more interested in the long term solution, as OL isn't the only tool facing this issue. I think we should put requirements in open_pdks for the interfaces with the DRC deck. This will involve fixes in both decks we have now (sky130 and gf180mcu), and precheck.

For sky130, the only actual interface with the deck is in precheck, which is a python script that calls the deck, but it is very specific for precheck.
For gf180mcu, there is a python wrapper around the deck in the pdk, but the interface with the deck itself is different than sky130

we should probably start by listing the difference in interfaces we have now, then come up with requirements for the current and future decks.

[mithro]

FYI - @proppy

[kareefardi]

@proppy are you doing similar work ?

[kareefardi]

Fixed by #2059