Instead of rolling our own we go with a known working UUID implementation
here. Dependency should be easy enough as more or less every Linux system
is shipping it anyway.
e_uuid_store provides an API to store various window/surface properties
in a mmapped shm memory object based on an assigned UUID. Its main purpose
will be to provide storage of these properties during session recovery when
E acts as a wayland compositor.
@feature
Chris Michael
Stefan Schmidt