Add PostgreSQL enums support to scaffolding

At least two things needed for it:

• generation of C# enums for enum types
• generation of DataType.Enum in mappings

[ademchenko]

Will add to next release. Could you provide more details what code you want to get generated?

So:

1. I would like to have the ability to generate the enum itself, but also to leave the ability to set up the own enum without the generation (like it’s made previously)
2. Mappings should be correctly set with NpgsqlDataSource (see the previous answer)

To recap: Suppose I have a postgres enum type a_db. There should be the ability to generate C# enum A_gen by the values of a_db. But, also, if a developer wants they should have the ability to map their own C# enum A_dev to database enum a_db and don’t get A_gen generated (turn off the particular enum generation).

[ademchenko]

@MaceWindu , mappings in npgsql version are configured with their new NpgsqlDataSource . They described the logic of their movement to the data source approach in the release notes. Could you tell if you have already moved your mapping code base to their data source?