Add Lxy cut and monitoring to TrigMultiTrkComboHypo

We may need lxy0 triggers so I have added the ability to cut on lxy and added monitoring for lxy,

Decoration code will no longer be called during Dimu L2 trigger (since it wasn't used).

I now pass eventcontexts to the VKalVrt, this avoids a threadlocal lookup which can hurt performance.