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Consistent variable naming
Description
We have some inconsistencies in variable naming. For example: PDN_CONNECT_MACROS_TO_GRID vs FP_PDN_SKIPTRIM.
EXTRA_LEFS vs EXTRA_GDS_FILES
Proposal
Be consistent with variable naming.
The reason these specific variables have been renamed is that these variables are used by every OpenROAD step, not just PDN generation.
I'm open to dropping all FP_.