Make TrackPar(Cov) compatible to GPU

[davidrohr]

@mconcas : This is my current state. It still fails compilation on HIP, but that should not bother your. Let's see if this passes the CI without AMD.
It is so far only TrackPar and TrackParCov, the Propagator will come next.
But I didn't test it yet, just compiled it with CUDA in Standalone mode, will become more mature the next days.

In order to use it:
The TPC GPU code works a bit differently compared to what you do in ITS. There is no separate compilation, but all files are included in the CU files. If you want to keep going with separate compilation, that should not be a problem. Just create a CU file that includes TrackParametrization.cxx and TrackParametrizationWithErrors.cxx (and later the propagator) and link that together with whatever code you write in your library. Symbols should not collide in theory. Let's see :)

[mconcas]

Thank you very much, looking forward to test it.

[davidrohr]

@mconcas : FYI: the problems with HIP are solved now. I still need to work on the propagator and then integrate it for the TPC refit, but at least the commits so far should not have side effects, and I'll merge this once the CI passes to have this part in already to have some stable basis to work on and to avoid merge conflicts.