Generate rst files

The process of auto-generating rst files which is based on the provided template, is executed after parsing XML data.

Along with process_generate_xmltree, this process is called at the beginning of building the documentation (not when Sphinx is parsing rst source files) to avoid internal linking problems.

DoxySummaryEntry	Simple class representing an entry in "doxysummary" directive.
DoxySummaryRenderer	Renderer generating rst files based on templates.
process_generate_files	Process generating rst files.