This patch brings scalable figure, image handling and a concept to
embed *render* markups:

* DOT (http://www.graphviz.org)
* SVG

For image handling use the 'image' replacement::

.. kernel-image:: svg_image.svg
:alt: simple SVG image

For figure handling use the 'figure' replacement::

.. kernel-figure:: svg_image.svg
:alt: simple SVG image

SVG image example

Embed *render* markups (or languages) like Graphviz's **DOT** is
provided by the *render* directive.::

.. kernel-render:: DOT
:alt: foobar digraph
:caption: Embedded **DOT** (Graphviz) code.

digraph foo {
"bar" -> "baz";
}

The *render* directive is a concept to integrate *render* markups and
languages, yet supported markups:

* DOT: render embedded Graphviz's **DOT**
* SVG: render embedded Scalable Vector Graphics (**SVG**)

Cc: Jani Nikula
Cc: Laurent Pinchart
Tested-by: Mauro Carvalho Chehab
Tested-by: Daniel Vetter
Signed-off-by: Daniel Vetter (v2 - v5)
Signed-off-by: Markus Heiser (v1, v6)
Signed-off-by: Jonathan Corbet