Added a process-role template (to preserve @role attributes as class values), and added an include-toc parameter

The include-toc parameter is true by default.

Also added process-role to the following elements:

* part
* chapter/preface/appendix/colophon/dedication
* footnote
* para/simpara, formalpara
* sect1, sect2, sect3, sect4, sect5
* sidebar
* note/tip/warning/caution/important
* blockquote/epigraph/quote
* equation/informalequation
* glossary, glossdiv, glossentry, glossterm, glossdef
* itemizedlist, orderedlist, variablelist, simplelist
* procedure, substeps
* programlisting/screen, literallayout, example
* figure/informalfigure
* table/informaltable
* thead, tbody, row, tr, th, td, entry
* indexterm