Proposal: Move primitive-Data.Primitive.Addr API into base

[Daniel Cartwright]

Motivation: There are a lot of places in base where 'Ptr a' is used in
place of 'Addr', because in base there is no 'Addr', only 'Addr#'. The
problem lies in the fact that many of these uses of 'Ptr a' are lying; the
'a' value is meaningless. Authors of functions therein have used things
like 'Ptr ()', 'Ptr Word8', 'Ptr a', but these types do not mean what they
say they mean - they're just Addr. There are probably other motivations for
this that I can't think of off the top of my head right now.
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