Define portable data formats that wrap a simple C-style `struct` and can be persisted to ROOT files

`PortableHostObject`

`PortableDeviceObject`

`ALPAKAACCELERATORNAMESPACE::PortableObject`

`PortableObject`

Define portable data formats that wrap SoA data structures and can be persisted to ROOT files

`PortableHostCollection`

`PortableDeviceCollection`

`ALPAKAACCELERATORNAMESPACE::PortableCollection`

`PortableCollection`

Notes

Multi layout collections

ROOT dictionary declaration helper scripts