Draft: Resolved pi0 ThOr to standard_particles
Several (new) lines are using make_resolved_pi0s from standard_particles. This is currently still based on the LoKi combiners. The switch to ThOr is made in this MR.
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Several (new) lines are using make_resolved_pi0s from standard_particles. This is currently still based on the LoKi combiners. The switch to ThOr is made in this MR.