Don't discard high-precision cursor position data (#1375)

* Don't discard high-precision cursor position data

Most platforms (X11, wayland, macos, stdweb, ...) provide physical
positions in f64 units, which can contain meaningful fractional
data. For example, this can be empirically observed on modern X11
using a typical laptop touchpad. This is useful for e.g. content
creation tools, where cursor motion might map to brush strokes on a
canvas with higher-than-screen resolution, or positioning of an object
in a vector space.

* Update CHANGELOG.md

Co-Authored-By: Murarth <murarth@gmail.com>

Co-authored-by: Murarth <murarth@gmail.com>

src/event.rs

@@ -242,7 +242,7 @@ pub enum WindowEvent<'a> {
         /// (x,y) coords in pixels relative to the top-left corner of the window. Because the range of this data is
         /// limited by the display area and it may have been transformed by the OS to implement effects such as cursor
         /// acceleration, it should not be used to implement non-cursor-like interactions such as 3D camera control.
-        position: PhysicalPosition<i32>,
+        position: PhysicalPosition<f64>,
         #[deprecated = "Deprecated in favor of DeviceEvent::ModifiersChanged"]
         modifiers: ModifiersState,
     },