Add support for nullable array types (fixes #157) #175
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This incurs lots of changes because the type regex was changed; there is only one line that was uniquely changed*.
I think this should be all that is required for the "nullable reference types" feature of C#8, since arrays are the only type (if I'm not mistaken) that are reference types distinguishable by syntax, and nullable value types already existed before.
* edit: I split the line into multiple for readability.
Fixes #157