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ecore_wayland: add listener for uuid and provide already existing one

Authored by stefan_schmidt.

Description

ecore_wayland: add listener for uuid and provide already existing one

Setup a listener to receive an uid from the compositor. If we already have
one during creation, aka we are re-connecting to recover a session, we provide
it to the compositor so it can look our attributes up based on it. Again hidden
behind and env var to avoid problems with other developments, for now.

ref T2922

Details