Surfaces : Use CachedUniquePtr rather than CachedUniquePtrT, use make_shared rather than new
requested to merge ATLAS-EGamma/athena:Surfaces_change_CachedUniquePtrT_to_CachedUniquePtr into master
- Use CachedUniquePtr rather than CachedUniquePtrT (e.g const version).
- use make_shared rather than new for constructing shared ptr