Adding Constraints to Ecto's Changeset

[Darkhood148]

Currently we only add constraints to Ecto migrations, which raise error at the database level. This works, but it would be better to have error messages at application level. To do this we must also add constraints in corresponding Changesets for all constraints in schemas. You can work on it by looking at the migrations in priv/repo/migrations and look at the different types of constraints and add them in changesets accordingly.

[Darkhood148]

Also add them where elements of array require a reference to some other column. (Join Tables?)