Add Duals, Objects, and fix SumPreCategory

After    | File Name                             | Before
-----------------------------------------------------------
0m41.43s | Category/Equality                     | 0m30.63s
0m18.50s | Functor/Equality                      | 0m20.73s
0m16.50s | NaturalTransformation/Equality        | 0m17.93s
0m11.88s | Comma/CommaCategory                   | 0m12.35s
0m09.36s | Groupoid                              | 0m05.65s
0m08.24s | Category/Morphisms                    | 0m08.22s
0m05.08s | Grothendieck/ToSet                    | 0m05.22s
0m04.26s | Groupoid/Functors                     | 0m04.16s
0m02.46s | NaturalTransformation/Composition     | 0m02.46s
0m02.37s | SumPreCategory                        | 0m02.16s
0m02.18s | Functor/CompositionLaws               | 0m02.48s
0m02.04s | ProductPreCategory                    | 0m02.09s
0m01.58s | NaturalTransformation/CompositionLaws | 0m01.65s
0m01.10s | InitialTerminalCategory               | 0m01.16s
0m00.94s | NatCategory                           | 0m00.96s
0m00.62s | BoolCategory                          | 0m00.66s
0m00.56s | SetCategory                           | 0m00.62s
0m00.33s | Common                                | 0m00.40s
0m00.28s | NaturalTransformation/Identity        | 0m00.31s
0m00.26s | FunctorPreCategory                    | 0m00.22s
0m00.24s | Functor/Composition                   | 0m00.26s
0m00.20s | Category/Core                         | 0m00.20s
0m00.19s | Category/Objects                      |   N/A
0m00.18s | Category/Duals                        |   N/A
0m00.16s | Peano                                 | 0m00.17s
0m00.14s | Functor/Core                          | 0m00.11s
0m00.14s | NaturalTransformation/Core            | 0m00.18s
0m00.13s | Functor/Identity                      | 0m00.10s
0m00.13s | ComputableCat                         | 0m00.13s
0m00.10s | Category/Category                     | 0m00.11s
0m00.10s | Grothendieck                          | 0m00.08s
0m00.09s | Category/StrictCategory               | 0m00.12s
0m00.09s | Utf8                                  | 0m00.08s
0m00.09s | Functor                               | 0m00.08s
0m00.08s | NaturalTransformation                 | 0m00.10s
0m00.08s | DiscreteCategory                      | 0m00.11s
0m00.07s | NotationsUtf8                         | 0m00.05s
0m00.05s | Notations                             | 0m00.05s
-----------------------------------------------------------
2m12.22s | Total                                 | 2m01.98s