Update HoTT
Add some partial proofs about groupoid functors
Remove some cruft

After    | File Name                             | Before
-----------------------------------------------------------
0m27.01s | Category/Equality                     | 0m27.54s
0m17.93s | Functor/Equality                      | 0m17.69s
0m15.75s | NaturalTransformation/Equality        | 0m15.15s
0m11.24s | Comma/CommaCategory                   | 0m11.14s
0m07.82s | Category/Morphisms                    | 0m07.62s
0m04.99s | Groupoid                              | 0m05.30s
0m04.90s | Grothendieck/ToSet                    | 0m04.50s
0m03.67s | Groupoid/Functors                     | 0m03.66s
0m02.14s | NaturalTransformation/Composition     | 0m02.06s
0m02.08s | Functor/CompositionLaws               | 0m02.25s
0m01.96s | ProductPreCategory                    | 0m01.87s
0m01.86s | SumPreCategory                        | 0m02.01s
0m01.44s | NaturalTransformation/CompositionLaws | 0m01.38s
0m01.08s | InitialTerminalCategory               | 0m01.07s
0m00.84s | NatCategory                           | 0m01.36s
0m00.66s | BoolCategory                          | 0m00.67s
0m00.44s | SetCategory                           | 0m00.59s
0m00.30s | Common                                | 0m00.33s
0m00.28s | NaturalTransformation/Identity        | 0m00.27s
0m00.28s | Functor/Composition                   | 0m00.24s
0m00.25s | FunctorPreCategory                    | 0m00.22s
0m00.16s | Category/Core                         | 0m00.13s
0m00.14s | Functor/Core                          | 0m00.12s
0m00.14s | NaturalTransformation/Core            | 0m00.14s
0m00.13s | ComputableCat                         | 0m00.10s
0m00.12s | Category/Category                     | 0m00.09s
0m00.12s | Peano                                 | 0m00.12s
0m00.11s | Functor                               | 0m00.10s
0m00.10s | Category/StrictCategory               | 0m00.10s
0m00.10s | DiscreteCategory                      | 0m00.10s
0m00.10s | Grothendieck                          | 0m00.10s
0m00.09s | NaturalTransformation                 | 0m00.09s
0m00.09s | Functor/Identity                      | 0m00.11s
0m00.09s | Utf8                                  | 0m00.06s
0m00.06s | Notations                             | 0m00.05s
0m00.05s | NotationsUtf8                         | 0m00.06s
-----------------------------------------------------------
1m48.51s | Total                                 | 1m48.38s