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* [x] I have followed the instructions in the PR template Currently eframe [calls `prevent_default()`](962c7c7516/crates/eframe/src/web/events.rs (L307-L369)) for all copy / paste events on the [*document*](962c7c7516/crates/eframe/src/web/events.rs (L88)), making embedding an egui application in a page (e.g. an react application) hard (as all copy & paste functionality for other elements on the page is broken by this). I'm not sure what the motivation for this is, if any. This commit / PR adds a callback (`should_prevent_default`), similar to `should_propgate_event`, that an egui application can use to overwrite this behavior. It defaults to returning `true` for all events, to keep the existing behavior. I call `should_prevent_default` in every place that `should_propagate_event` is called (which is not all places that `prevent_default` is called!). I'm not sure for the motivation of not calling `should_propagate_event` everywhere that `stop_propagation` is called, but I kept that behavior for the `should_prevent_default` callback too. Please let me know if I'm missing some existing functionality that would allow me to do this, or if there's a reason that we don't want applications to be able to customize this (i.e. if there's a reason to always `prevent_default` for all copy / paste events on the whole document)