Rationalize names
- rename LHCb::Pr::FT::PrSciFiHits into LHCb::Pr::FT::Hits
- add a (deprecated) using statement for PrSciFItHits
- move {Hot,Cold}HitInfo types into the Hits scope
should be applied in conjunction with Rec!2553 (merged)
Edited by Gerhard Raven