Binding for tilt_x etc on PointerEvents is wrong

[wareya]

Describe the Bug

e.g.

wasm-bindgen/crates/web-sys/src/features/gen_PointerEvent.rs

Line 56 in c35cc93

pub fn tilt_x(this: &PointerEvent) -> i32;

Return value is i32, but it needs to be Option<i32>.

Additional Context

tiltX, tiltY, azimuthAngle, and altitudeAngle are only reported if that is the format that is reported by the pointing device, and whether or not they are supported is necessary information because otherwise the application does not know which one to use. If they are unsupported, they evaluate to undefined instead of a number. Throwing that information away and returning a dummy value or throwing a panic makes it impossible to use them correctly.

[wareya]

Oh, i32 is totally wrong anyway, it should be f64 or f32. Devices can report fractional values for these even though it's rare to do so.

[wareya]

Huh, this might actually be a Firefox bug? I was getting undefined for azimuth/altitude angle with on device that didn't report it, but the spec (https://www.w3.org/TR/pointerevents/#dom-pointerevent-altitudeangle) specifies:

For hardware and platforms that do not report tilt or angle, the value MUST be π/2.

...But it IS reporting tilt/angle, just in tiltX and tiltY instead of azimuthAngle/altitudeAngle. And Firefox isn't converting from tiltX/tiltY to azimuth/altitude.