Added prototypes for the new codec APIs for strings. These APIs match the ones in the Unicode implementation, but were extended to be able to reuse the existing Unicode codecs for string purposes too.
Added prototypes for the new codec APIs for strings. These APIs
match the ones in the Unicode implementation, but were extended
to be able to reuse the existing Unicode codecs for string
purposes too.

Conversion from string to Unicode and back are done using the
default encoding.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator