v19.4.0

Feature

• EDM4hep IO (#1260) (0955220) (@andiwand)
• TGeoLayerBuilder has configurable detector element factory (#1293) (4adaf4c) (@paulgessinger)
• Fast clusterization (#1190) (5ad6aa7) (@gagnonlg)
• Update ITk seeding example (#1278) (e5e62f3) (@LuisFelipeCoelho)

Test

• Remove kalman smoother related log thresholds (#1302) (d7c311f) (@andiwand)
• Parametrize tests on geometry, add minimal GSF reproducibility test (#1292) (e51585c) (@paulgessinger)

Fix

• Python helper fails if hepmc3 is not preset (#1303) (51e764d) (@andiwand)
• Json gcc runtime error (#1301) (695d9e2) (@andiwand)
• Regularize GainMatrixSmoother inverse (#1298) (d3bddc9) (@andiwand)
• Output ROOT file closing on destruct (#1296) (83880e0) (@paulgessinger)
• Bug in itk_seeding.py (#1295) (a4a1b96) (@LuisFelipeCoelho)
• data is private in MultiTrajectory GrowableColumns (#1289) (a6fa2ba) (@wdconinc)

Refactor

• More flexible logging failure threshold facility (#1297) (f95a332) (@paulgessinger)