Include ranges in typing for resi AtomSelectionSpec

[randyn]

• Adds a literal type for a SelectionRange and adds it into the union type for resi
• Adds arrays as a valid type for resi as well

There are a couple other fields on AtomSpec that are also typed as number, but I'm not sure which ones we intentionally want to allow ranges for. I'm happy to update those too, this just happened to be the only one I'm looking at right onw

[dkoes]

Better typing is always appreciated! Although maintaining the whitespace style makes for a cleaner diff.