Added diffusion reset in hydro when doing feedback and updated function signatures

Merged Josh Borrow requested to merge swift-fix-viscosity-reset into master

We need to also reset the diffusion to zero when doing feedback as well as resetting the viscosity to max.

I have:

  • Done this for schemes that include variable diffusion
  • Re-named the function to hydro_diffusive_feedback_reset as this no longer only resets the viscosity
Edited by Josh Borrow

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