Time evolution refactoring

[stavros11]

Completes refactoring of time evolution models and related callbacks.

[codecov]

Codecov Report

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##             abstrtnp     #603   +/-   ##
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  Coverage            ?   77.26%           
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  Files               ?       86           
  Lines               ?    11997           
  Branches            ?        0           
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  Hits                ?     9270           
  Misses              ?     2727           
  Partials            ?        0           

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unittests	77.26% <0.00%> (?)

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