Allow a kotlin type to be used as graphql type and inputType

[Bertrand]

Allows reusing the same kotlin type (with a different name attribute) in a gql type and a gql inputType.

Avoids many useless kotlin type duplication to circumvent GraphQL constraint that output types cannot be input types (even when it's totally legit).

Example use :

val schema = KGraphQL.schema {
inputType() {
name="TypeAsInput"
}
type() {
name="TypeAsObject"
}
}

[coveralls]

Coverage increased (+0.2%) to 88.08% when pulling 2dfc9d5 on Bertrand:same_type_used_for_object_and_inputtype into 42fef4a on pgutkowski:master.

[coveralls]

Coverage increased (+0.2%) to 88.08% when pulling 2dfc9d5 on Bertrand:same_type_used_for_object_and_inputtype into 42fef4a on pgutkowski:master.