Add some comments to the random number generator to make sure we don't change the numbers by mistake.

Update the other hydro schemes to also compile with the star formation model and entropy floor model.

When recovering the mass of a particle, use the 'hydro_get_mass()' function such that the subgrid model also works for gizmoid schemes.

Don't read h into cache when calculating subset density interactions as h is not used in the function and causes a race condition warning in the thread sanitizer.