Allow Fable 5 to be used with Fable 4 plugins

[ncave]

• Fixes Fable 5, not compatible with Fable 4 plugins #3962

[MangelMaxime]

Thank you @ncave.

I added some simple tests to covert our needs.

I think in the future, we will need a more specific logic to manual control the range of which version of Fable support which version of Fable.AST but for our current needs it should work fine.

Waiting for the CI to confirm that that all is still good before making a new release

[MangelMaxime]

@ncave I added what I think was a missing parenthesis but even with that a test is still failing on the CI.

It works on my machine... do you have an idea?

[ncave]

@MangelMaxime

I added what I think was a missing parenthesis

No, that's not going to change anything, the operator precedence is the same.
It must be something else.

[MangelMaxime]

I think I was just tired, I was not running the correct tests locally.

And it appears that in my tests, I had the argument order inverted.

Waiting for the CI to confirm that all is good now 🤞