refactor!: Make ActionHandler::do_action take &mut self
#296
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I believe this isn't controversial like my previous, abandoned PR or the other API change I'm currently considering. I'm pretty sure it's conceptually correct, because an action handler needs to mutate the application's state, and it's better to have the platform adapters handle interior mutability in the way that's appropriate for each platform's threading requirements than to make the user do it. This simplifies the winit adapter and makes the C API a bit safer.