bplist: Disallow key nodes with non-string node types

As reported in #86, the binary plist parser would force the type of the
key node to be of type PLIST_KEY while the node might be of a different
i.e. non-string type. A following plist_free() might then call free() on
an invalid pointer; e.g. if the node is of type integer, its value would
be considered a pointer, and free() would cause an error.
We prevent this issue by disallowing non-string key nodes during parsing.

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