WIP : Convert VPLightCluster to not use vector<LHCb::ID> FollowUp LHCb !1146
Follow up on LHCb merge request LHCb!1146 (closed) Adapt code to not use VPCluster::pixels()
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Follow up on LHCb merge request LHCb!1146 (closed) Adapt code to not use VPCluster::pixels()