Clean up the types of cerl

The introduction of c_map and c_map_pair was not done properly. In
particular, the definition of ctype() and an important Edoc comment
were not up-to-date.

While at it,
 - some more types were cleaned up and exported so as to be used
   in core_parse.hrl and
 - some obviously dead code was removed (the type/1 function does
   not return 'nil', which in turn simplified a clause in the code
   of meta_1/2).

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