a1dc432c9c
This PR cleans up a big source of complexity in our pointer handling code. It also drops support for Safari versions prior to 13 ([caniuse](https://caniuse.com/mdn-api_pointerevent)). Right now, we throw a hard error when running in a browser that doesn't support `PointerEvent`s. Should we turn it into a soft warning, and just disable gesture/pointer handling on those browsers? For users who need to support older versions of Safari, they can try this polyfill: https://github.com/wessberg/pointer-events (thanks @ditman!) Fixes https://github.com/flutter/flutter/issues/116141
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