Updates use of Cogl in line with api changes

Updates use of Cogl in line with api changes

Some of Cogl's experimental apis have changed so that the buffer apis
now need to be passed a context argument and some drawing apis have been
replaced with cogl_framebuffer_ drawing apis that take explicit
framebuffer and pipeline arguments.

These changes were made as part of Cogl moving towards a more stateless
api that doesn't rely on a global context.

This patch updates Clutter to work with the latest Cogl api and bumps
the required Cogl version to 1.9.5.

Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
Reviewed-by: Neil Roberts <neil@linux.intel.com>