Add forward declaration for jets and b-tagging
The b-tagging and jet headers include a lot of other headers. This is my attempt at reducing this a bit. I added xAODJet/JetFwd.h
and xAODBTagging/BTaggingFwd.h
, and the corresponding headers for the containers.
I'm not sure if everything is being done correctly, I should ask @christos who I think implemented something like this for egamma. Also tagging @wbalunas and @duperrin.