Follow migration of v2::Particle to LHCb

This goes with LHCb!2626 (merged), following the migration of and changes to v2::Composites.

cc: @nnolte

mentioned in merge request LHCb!2626 (merged)

added 7 commits

• 6672b7d4...b0ad5598 - 4 commits from branch master
• 8fb61041 - Move Particle_v2.h to LHCb.
• 27757e0e - Update include paths to Particle_v2.h
• 8710da6a - Follow changes in v2::Composites class.

Compare with previous version

added lhcb-gaudi-head label

@olupton Can this MR have its WIP status removed yet ?

removed lhcb-gaudi-head label

unmarked as a Work In Progress

changed title from WIP: follow migration of v2::Particle to LHCb to Follow migration of v2::Particle to LHCb

changed the description

• [2020-06-22 17:49] Validation started with lhcb-master-mr#970
• [2020-06-23 11:32] Validation started with lhcb-master-mr#976
• [2020-06-25 00:22] Validation started with lhcb-head#2632

resolved all threads

assigned to @jonrob

@olupton can you please add some labels to classify this MR, thanks.

added lhcb-head label

added Composites Event model Filters labels

approved this merge request

merged

mentioned in commit 3e240dc0

unassigned @jonrob

added cleanup label