Simplify LumiSequence: prefer single decoder, single filter

Gerhard Ravenrequested to merge
simplify-lumiseq into master
  • prefer single decoder instance, used in four sequences, over cloning four identical instances, configured identically except for their instance name
  • prefer single filter instance, used in four sequences, over cloning four identical instances, configured identically except for their instance name
  • prefer direct member initialization

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