- 💥[Feature] Simplify the hooks API. The modules `tutor.hooks.actions`, `tutor.hooks.filters`, and `tutor.hooks.contexts` are no longer part of the API. This change should not affect most developers, who only use the `Actions` and `Filters` classes (notice the plural) from `tutor.hooks`. (by @regisb)
    - Instead of `tutor.hooks.actions.get("some:action")`, use `tutor.hooks.Actions.SOME_ACTION`.
    - Instead of `tutor.hooks.filters.get("some:filter")`, use `tutor.hooks.Filters.SOME_FILTER`.
    - Instead of `tutor.hooks.actions.add("some:action")`, use `tutor.hooks.Actions.SOME_ACTION.add()`. The same applies to the `do` method.
    - Instead of `tutor.hooks.filters.add("some:filter")`, use `tutor.hooks.Filters.SOME_FILTER.add()`. The same applies to the `add_item`, `add_items`, `apply`, and `iterate` methods.
    - Instead of `tutor.hooks.contexts.enter`, use `tutor.core.hooks.contexts.enter`.