RST reader: improve parsing of inline interpreted text roles.

* Use a Span with class "title-reference" for the default
  title-reference role.
* Use B.text to split up contents into Spaces, SoftBreaks, and Strs
  for title-reference.
* Use Code with class "interpreted-text" instead of Span and Str for
  unknown roles.  (The RST writer has also been modified to round-trip
  this properly.)
* Disallow blank lines in interpreted text.
* Backslash-escape now works in interpreted text.
* Backticks followed by alphanumerics no longer end interpreted text.

Closes #4811.

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