use constants struct for small velo ut LUTs
- rename GpuConstants into Constants -> also save host constants for those algorithms running on both architectures
- save ut_dxDy in LUT in Constants, rather than using an un-safe function for it
- delete VeloUTTracking::HitsSoA.cos, rather calculate it from ut_dxDy when needed -> save space
Edited by Dorothea Vom Bruch