Overlay: Add BCM new-style config + fix data overlay
This ended-up a bigger MR than expected, but here we go. The goal was to add new-style config for BCM overlay. In the process data overlay for BCM has also been fixed (ATLASSIM-4622).
Some observations:
- BCM stores multiple BCIDs for data (5 in my tests), one for MC.
- The order of collections is not deterministic.
Changes:
- Map the channels to collections as direct loop is not possible.
- For data: find event BCID from data RDOs and use that one for overlay, do not store the rest if not required.
Edited by Tadej Novak