Add the category of torsion abelian groups#150
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This PR adds the category of torsion abelian groups. It turns out to be much more well-behaved than the category of torsion-free abelian groups (#142). It is a Grothendieck abelian category and locally finitely presentable. The only difference to Ab is that it is not finitary algebraic (in fact, not locally strongly finitely presentable).
All properties have been decided.