Web touch event (#2188)

* feat: add pointer events to web

* feat: remove PointerType for touch events

* Remove duplicate

* Changelog and features

* Remove PointerType

* feat: renamed events, added touch type guard

* Rename

* Flip the y axis

* Fix physical position and add force

* Update comment

* Update features

* Use normalized force

* Remove unnecessary todos

* Update comment

* Refactor add touch_handler

* Rephrase by Liamolucko

* Update CHANGELOG.md

* Fix duplicate mouse and touch events

* Removed workaround for scale factor

* Flip the y axis

* Fix

* Fmt

* Replace `match` with a single pattern with `if let`

* Update documentation

* Have one callback per event

* Remove a comment

* Fix

* Remove y-axis flip

* Update src/event.rs

Co-authored-by: Mads Marquart <mads@marquart.dk>

* Fix platform specific comment

* Fix extra argument to `touch_position` function

Co-authored-by: Dany Sluijk <me@dany.dev>
Co-authored-by: Johan Klokkhammer Helsing <johanhelsing@gmail.com>
Co-authored-by: oscrim <oscar@widefind.se>
Co-authored-by: Mads Marquart <mads@marquart.dk>

src/event.rs

@@ -477,6 +477,10 @@ pub enum WindowEvent<'a> {
     },
 
     /// Touch event has been received
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **macOS:** Unsupported.
     Touch(Touch),
 
     /// The window's scale factor has changed.
@@ -924,6 +928,10 @@ pub enum TouchPhase {
 /// A [`TouchPhase::Cancelled`] event is emitted when the system has canceled tracking this
 /// touch, such as when the window loses focus, or on iOS if the user moves the
 /// device against their face.
+///
+/// ## Platform-specific
+///
+/// - **macOS:** Unsupported.
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Touch {
     pub device_id: DeviceId,