core: add got_media_event to Collection and use in Orchestrator
core: add got_media_event to Collection and use in Orchestrator

Signed-off-by: Bas Westerbaan <1d31d94f30d40df7951505d1034e1e923d02ec49@fsfe.org>

bwesterb/mirte,marietje/maried,bwesterb/sarah