Enhance consistency

Make sure that consistency is achieved in the specified information by improving the validation and checking functions.

## Example: Mismatching datatypes in directive.

```gql
type Car {
length: Int @range(min:0.0, max:100.0)
}
```
Here, the output type differs from the datatype used inside the directive.

## Example: Wrong use of limits
```gql
type Car {
doors: [Door] @cardinality(min:5, max:0)
}
```
Here, `min` is less than `max`, which should throw an error.

## Example: custom directive used wrongly
```gql
type Car {
color: String @noDuplicates
}
```
Here, the `@noDuplicates` directive is to be used in combination with the List output type modifier.

etc...