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<https://github.com/RTimothyEdwards/open_pdks/pull/348|#348 Kklayout XOR updates>
Pull request opened by <https://github.com/kareefardi|kareefardi>
update commit references of gf180mcu_fd_pr and klayout_sky130  
rename `.lmp` to `.map` (as observed in github issues of klayout)  
rename `KLAYOUT_XOR_IGNORE_LIST` to `KLAYOUT_XOR_IGNORE_LAYERS`  
add map file variable for gf180mcu
<https://github.com/RTimothyEdwards/open_pdks|RTimothyEdwards/open_pdks>
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