Add first wave of doxygen documentation and make the documentation known to the packaging setup.
[ Thomas Voß ]
* * Adjust the cmake setup and get rid of -DUSE_GLES, instead rely on
  automatic detection if the header is available. * Adjust the cmake
  setup to bail out if EGL is not available. * Adjust the cmake setup
  to autogenerate doxygen API documentation.
* * Add a pkgconfig file for the platform API * Adjust installation of
  header files to account for version.
[ Ubuntu daily release ]
* Automatic snapshot from revision 84
Addressing review comments.
 Adjust Document:-line.
Add first wave of doxygen documentation and make the documentation known to the packaging setup.

Approved by PS Jenkins bot, Ricardo Salveti.