Provide a hook to alter xAPI statements

This information is built in the field formatter, but there's no alter hook. I think it should be straightforward to add one, and it's necessary to cleanly integrate H5P with an LRS, where you need any control over the data that gets sent.

catch → credited graber → .

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This isn't possible with the way H5P core currently works - the only place you can modify the statement data is when interacting with the H5P event in js just before you send it to the LRs. I don't see a way to allow that to be modified generically in PHP without a major refactoring.

Hmm, the situation is exactly the same with A360 Xapi activities. The only way to alter the statements would be using a proxy with an alter option but that's an additional middle step which means performance drop.