write run2 packed event model directly from Lamarr

With !976 (relying on Run2Support!37 , Run2Support!38 , Run2Support!40 , Run2Support!41 , Run2Support!42 , Run2Support!44 ) it is possible to use the Run2:: namespaced wrapped event model. To have it be written in a way that all downstream components are correctly picked up, one needs to write the packed version of the event model (implemented with Run2Support!44). Only then is Run2 readable.

I write here for solving.