Add linters for datatypes

[bernt-matthias]

• tools should only use available datatypes in inputs, outputs and tests
• discourage the use of custom datatypes_conf.xml

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[bernt-matthias]

Is this what you thought about @mvdbeek and @nsoranzo? Then I would be happy to get this in.