Re #7746. Create new LiveData package and move files into it.
Re #7746. Remove moved files from DataHandling CMakeLists.
Re #7746. Fix include paths.

The library now compiles and the tests pass.
Re #7746. Move everything into a new LiveData namespace.
Re #7746. Move the ADARA files into a subdirectory.
Re #7746. Add README concerning ADARA classes.
Merge remote-tracking branch 'origin/feature/7746_create_livedata_package'