CaloUtils + CxxUtils + xAODCore + xAODTrackingCnv: Relocate FloatCompressor from xAODCore to CxxUtils
This MR relocates
CxxUtils and it's now called
CxxUtils::FloatCompressor. The rationale behind this update is to allow it to be used directly in
AthContainers, which is a package
xAODCore depends on. All existing clients are migrated.
I already bugged @akraszna and @ssnyder about this via email
WIP so that they have a chance to object if they think this is not a good idea for whatever reason, although I think it's a fairly uncontroversial move.
Edit: OK, let's un-