Convert developer manual to rst

Convert developer manual to rst

Convert all of docs/dev-manual/ to reStructuredText and generate the
documentation with Sphinx.  Also convert docs/doxygen/lib/doxygen.md and
example files related to that.

The actual text or content has mostly not changed, but some
reindentation and other formatting changes are quite extensive.
The only textual changes are in the top-level pages where the text and
presentation has been altered slightly to make them appear better with
Sphinx.  More work is still necessary to get the best possible
organization under Sphinx, but this should be a reasonable first step.

Change-Id: I9c322aca1f39dd3f54f1a6035b06ec298fc95e43