weston: add reference Wayland compositor
This is the reference Wayland compositor.
If the "wayland" DISTRO_FEATURE is present the KMS and Wayland (nested)
compositors are enabled.
If the "x11" DISTRO_FEATURE is present the X11 compositor is enabled, and a
launcher installed.
This also ships a basic Wayland terminal.
Based on work by Alexandru Damian <alexandru.damian@intel.com>, Daniel Stone
<daniel@fooishbar.org>, and Damien Lespiau <damien.lespiau@intel.com>.
Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
