add mostly-placeholder FillSchemeInfo with just bunch spacing for now, and placeholder producer (which nevertheless does something sensible for MC and existing data)

remove FillSchemeInfo (replaced by LumiRunInfo)
Make ecal multifit reconstruction key automatically on FillSchemeInfo to decide on 25ns vs 50ns-optimized configuration (10pulse vs 5pulse floating)
move fillSchemeInfo out of local reco sequence and directly into reco sequences
add FillSchemeInfo to fastsim reco sequences
fix ECALHCAL custom sequences to work with FillSchemeInfo
add FillSchemeInfo to heavy ion reco sequence