Better support for custom directives #915
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Prototype for #913 In this prototype, we check how we can apply custom directives much easier. Furthermore, we check if we can prove type safety, to that a custom directive that can be applied on some elements cannot be applied on others. Limitations: - a directive can be applied on a field definition for example. With that current approach, we cannot formulate that with the type system as a field definition lives in sangria.ast, and we only handle sangria.schema types. - we are introducing new types to mark on which elements a directive can be applied. Those types are kind of duplication of the current [sangria.schema.DirectiveLocation values](https://github.com/sangria-graphql/sangria/blob/f339b5df97bd89c2a24fcfc977a1f20191ffd7fc/modules/core/src/main/scala/sangria/schema/Schema.scala#L1136-L1158).
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Prototype for #913
This prototype is a version of #916 that tries to re-use DirectiveLocation