Add standalone DRC deck, modernize run_drc script based on IHP

[mole99]

This PR improves the standalone DRC deck, tech/drc/gf180mcu.drc, so that it can be used by the run_drc.py script.
Additionally, run_drc.py is updated to use argparse and integrate several enhancements from IHP.

In order to make the standalone DRC deck compatible with run_drc, only a few changes are necessary:

1. Each rule deck can be enabled by its own name (e.g. dnwell -> $dnwell)
2. run_drc.py does not use generate_drc_run_template anymore, instead gf180mcu.drc is called directly
3. For mp runs, disable feol, beol, offgrid and only enable the selected rule deck

With these changes, the behavior of run_drc.py is the same, without the need to assemble temporary DRC decks.
Furthermore, the gf180mcu.drc can be used standalone with the option to enable a group of rule decks (feol, beol, offgrid) or individual ones (e.g. $dnwell = "true").