pypeit/PypeIt: Release 1.2.0

, Joseph Hennawi, Ryan Cooke, Kyle Westfall, Feige Wang, , , Asher Wasserman, Milan Roberson, , Alexa Villaume, , , , David Young, Andreas Flörs, Matt Wilde, Sunil Simha, Nicolas Tejos, Brad Holden, Jacob Isbell, Edward Betts, Zlatan Vasović & Nathan Sandford
Minor updates to SpecObj datamodel. DEIMOS slitmask slurping in place!
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