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GEAR sinks: add better time-step and sink merging constraints

Darwin requested to merge darwin/gear_sink_timesteps into master

In this MR, I added timestep constraints to the sink and made the sink-sink swallow criteria more similar to the gas ones.

  • Sinks follow the gas dynamics more closely with a CFL and gas free fall time-step constraints.
  • They now have a birth time and thus an age. I implemented time-step constraints based on their age category, similar to stars.
  • Dead sinks do not accrete anymore.
  • Sink merging criteria are the same as those for gas.

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