Add properties: subobject-trivial and quotient-trivial#149
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A category is subobject-trivial if every monomorphisms is an isomorphism. Dually, it is quotient-trivial if every epimorphism is an isomorphism. This is no standard terminology, and the properties are not much interesting in their own right. However, it makes sense to add them since they clarify the relationship between other properties. Also, some manual assignments could be removed. The properties have been decided for all categories (mostly using implications).