JugDigi::SimTrackerHitsCollector to deal with demuxed readouts

Wouter Deconinck requested to merge sim-tracker-hits-collector-edm4hep into master

Intended for syntax like this:

tracker_endcap_collections = [
    'TrackerEndcapHits1',
    'TrackerEndcapHits2',
    'TrackerEndcapHits3',
    'TrackerEndcapHits4',
    'TrackerEndcapHits5',
    'TrackerEndcapHits6'
]
trk_ec_coll = SimTrackerHitsCollector("trk_ec_coll",
        inputSimTrackerHits = tracker_endcap_collections,
        outputSimTrackerHits = "TrackerEndcapHits")

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