. Fixes: . Approved by Daniel van Vugt, Sam Spilsbury.

several changes to the compiz API.

* GLVertexBuffer class added for managing vertices, normals, texture
  coordinates, and colors
* GLProgram class added for managing GLSL programs
* GLProgramCache class added for managing per-plugin GLSL programs
  efficiently, uses an LRU cache to avoid recompiling recently used GLSL
  programs all the time
* GLShaderCache class added for managing dynamically created shader source
  code.
* GLFragment class removed as fragment programs are no longer used (replaced
  with GLSL programs)
* EGL context setup added
* EglTexture class added to use EGL_image extension instead of
  GLX_EXT_texture_from_pixmap for GLES. Fixes: https://bugs.launchpad.net/bugs/201342, https://bugs.launchpad.net/bugs/901097, https://bugs.launchpad.net/bugs/1004251, https://bugs.launchpad.net/bugs/1037710. Approved by Daniel van Vugt, Sam Spilsbury.

This commit refactors a bunch of the backend code, adds appropriate testsuites
and refactors the integration code to make it more flexible.

 * Integration is now an actual object, backends can communicate through
   instantiation of something that implements CCSIntegration, usually by also
   injection CCSIntegratedSettingFactory and CCSIntegratedSettingStorage.
   (For example, the GNOME Integration backend is configuration system
   agonistic, it uses CCSIntegratedSettingFactory to defer the construction
   of CCSIntegratedSetting objects which handle get/set operations until
   runtime).
 * Backends are now first-class objects too, CCSDynamicBackend implements
   CCSBackend and wraps it so that client code can safely call the functions
   without having to worry about null pointers
 * The GSettings backend is now also a first-class object, with most of its
   logic moved into its own class
 * Introduced a conformance test for backends, found in
   compizconfig/tests/compizconfig_backend_conformance_test.h . This is a
   templated test that can be instantied for any CCSBackend provided it also
   has a CCSBackendTestingEnvironment to go with it (this is used to
   read/write raw keys bypassing the backend). This code is itself tested
   against a mock backend and is used to test the GSettings backend itself
   by loading it into memory and running through its functionality
 * Increased test coverage in general for the GSettings backend through our
   existing testsuite, we're now at about 93% coverage for the backend
   itself (There is no test coverage for the integration code,
   but that is coming).
 * Fixed some runtime errors with the python tests.

(LP #1035261). Fixes: . Approved by Sam Spilsbury.

Merged compiz.ccs_move_gconf_integration_to_gnome_integration into compiz.ccs_gnome_integration_abstract_writers.

Merged compiz.ccs_gsettings_conformance_test into compiz.ccs_move_gconf_integration_to_gnome_integration.

Merged compiz.ccs_integration_interface_gconf_refactor into compiz.ccs_backend_conformance_test_file.

  - No blending
  - Incorrect colouring
  - Flickering (due to no damage)
(LP: #1039880)

Detect if rsvg 2.36.2 is installed (LP: #1039843). Fixes: https://bugs.launchpad.net/bugs/1039843. Approved by Sam Spilsbury.

Merged compiz.ccs_move_gconf_integration_to_gnome_integration into compiz.ccs_gnome_integration_abstract_writers.

Merged compiz.ccs_gsettings_conformance_test into compiz.ccs_move_gconf_integration_to_gnome_integration.