Update HoTT
Remove some useless things in Common.v

It moved into the HoTT library.

After    | File Name                             | Before
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0m17.24s | Category/Equality                     | 0m16.91s
0m10.79s | Comma/Duals                           | 0m10.38s
0m09.49s | Groupoid                              | 0m09.03s
0m08.00s | Comma/InducedFunctors                 | 0m07.79s
0m05.26s | Category/Morphisms                    | 0m05.33s
0m04.46s | SumPreCategory                        | 0m04.67s
0m04.22s | Functor/Equality                      | 0m04.26s
0m04.10s | Groupoid/Duals                        | 0m03.88s
0m03.56s | Groupoid/Functors                     | 0m03.62s
0m03.26s | UniversalProperties                   | 0m03.46s
0m02.68s | Grothendieck/ToSet                    | 0m02.66s
0m02.42s | BoolCategory                          | 0m02.47s
0m02.40s | Comma/CommaCategory                   | 0m02.58s
0m01.95s | NaturalTransformation/Equality        | 0m01.92s
0m01.83s | Category/Product                      | 0m01.86s
0m01.72s | NaturalTransformation/Duals           | 0m01.80s
0m01.66s | Hom                                   | 0m01.66s
0m01.39s | NaturalTransformation/Product         | 0m01.43s
0m01.30s | NaturalTransformation/Composition     | 0m01.32s
0m01.20s | Functor/Product                       | 0m01.22s
0m01.20s | NaturalTransformation/CompositionLaws | 0m01.17s
0m01.13s | NaturalTransformation/Isomorphisms    | 0m01.09s
0m00.94s | FunctorCategory/Morphisms             | 0m00.92s
0m00.78s | Cat/Morphisms                         | 0m00.72s
0m00.58s | InitialTerminalCategory               | 0m00.63s
0m00.52s | Functor/CompositionLaws               | 0m00.43s
0m00.38s | Comma/Projection                      | 0m00.40s
0m00.36s | Common                                | 0m00.45s
0m00.33s | IndiscreteCategory                    | 0m00.26s
0m00.32s | Discrete/Duals                        | 0m00.34s
0m00.31s | NaturalTransformation/Identity        | 0m00.30s
0m00.29s | Cat                                   | 0m00.28s
0m00.28s | FunctorCategory                       | 0m00.25s
0m00.26s | Functor/Composition                   | 0m00.23s
0m00.25s | SetCategory                           | 0m00.29s
0m00.24s | Adjoint/UnitCounit                    | 0m00.28s
0m00.23s | Functor/Duals                         | 0m00.23s
0m00.23s | NaturalTransformation/Core            | 0m00.19s
0m00.22s | IsGroupoid                            | 0m00.22s
0m00.21s | Category/Objects                      | 0m00.25s
0m00.20s | Category/Core                         | 0m00.18s
0m00.18s | NatCategory                           | 0m00.22s
0m00.17s | NatCategory/Duals                     | 0m00.13s
0m00.17s | Category/Duals                        | 0m00.14s
0m00.15s | NaturalNumbersObject                  | 0m00.16s
0m00.14s | ComputableCat                         | 0m00.13s
0m00.12s | Functor/Core                          | 0m00.10s
0m00.12s | Category/UnivalentCategory            | 0m00.10s
0m00.12s | Peano                                 | 0m00.12s
0m00.10s | Functor/Identity                      | 0m00.10s
0m00.10s | Functor                               | 0m00.11s
0m00.10s | DiscreteCategory                      | 0m00.10s
0m00.10s | Utf8                                  | 0m00.09s
0m00.10s | Grothendieck                          | 0m00.10s
0m00.09s | Category                              | 0m00.10s
0m00.09s | Category/StrictCategory               | 0m00.08s
0m00.08s | NaturalTransformation                 | 0m00.11s
0m00.04s | NotationsUtf8                         | 0m00.04s
0m00.04s | Notations                             | 0m00.05s
-----------------------------------------------------------
1m40.19s | Total                                 | 1m39.33s