Ban `main@generator` models

[sergej-koscejev]

Ban models named main@generator because they are not specific enough. They should have a FQN starting with the language name or something.

[sergej-koscejev]

Can be achieved with fail:

-   repo: local
    hooks:
    -   id: generator-template-model-names
        name: generator template models must have non-generic names
        entry: generator template models must have non-generic names
        language: fail
        files: '/main@generator\.mps$'

[sergej-koscejev]

Actually, it cannot because a model named foo.bar.main@generator.mps may be legitimately located in main@generator.mps.