Refactor CFL parameter usage

Previously we required each project to apply CFL in their timestep! function.

We now apply CFL to the result proposed by timestep! in a central place, hence, timestep! no longer has to account for that.

This PR also moves the parameter cfl from the Mesh section to the Evolution section. All corresponding reference tests are updated here too.

added parameters refactor time stepping labels

enabled an automatic merge when the pipeline for 84caa2a9 succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• 191b4598 - fix tests

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enabled an automatic merge when the pipeline for 191b4598 succeeds

merged

mentioned in commit c7e42113

mentioned in commit 5ad99e58

mentioned in commit 1ee33239