proarrow-0: Category theory with a central role for profunctors

Index - :

:&&&: 
1 (Type/Class)Proarrow.Category.Instance.Cat
2 (Data Constructor)Proarrow.Category.Instance.Cat
:**: 
1 (Type/Class)Proarrow.Category.Instance.Product
2 (Data Constructor)Proarrow.Category.Instance.Product
:*: 
1 (Type/Class)Proarrow.Profunctor.Product
2 (Data Constructor)Proarrow.Profunctor.Product
:++:Proarrow.Category.Instance.Coproduct
:+:Proarrow.Profunctor.Coproduct
:-Proarrow.Category.Instance.Constraint
:.: 
1 (Type/Class)Proarrow.Profunctor.Composition
2 (Data Constructor)Proarrow.Profunctor.Composition
:::Proarrow.Category.Bicategory
:=>Proarrow.Category.Instance.Constraint
:|Proarrow.Category.Instance.Free
:~>Proarrow.Core
:~>:Proarrow.Profunctor.Exponential