Make size/position types generic over pixel type (#1277)

* Begin implementing DPI generics

* Fix multithreaded example

* Format

* Fix serde test

* hopefully fix most of the errors

* Fix dpi module errors

* More error fixings

* Format

* fix macos errors

* Another error pass

* Replace bad type signatures

* more fixins

src/window.rs

@@ -422,7 +422,7 @@ impl Window {
     ///
     /// [safe area]: https://developer.apple.com/documentation/uikit/uiview/2891103-safeareainsets?language=objc
     #[inline]
-    pub fn inner_position(&self) -> Result<PhysicalPosition, NotSupportedError> {
+    pub fn inner_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         self.window.inner_position()
     }
 
@@ -441,7 +441,7 @@ impl Window {
     /// - **iOS:** Can only be called on the main thread. Returns the top left coordinates of the
     ///   window in the screen space coordinate system.
     #[inline]
-    pub fn outer_position(&self) -> Result<PhysicalPosition, NotSupportedError> {
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
         self.window.outer_position()
     }
 
@@ -470,7 +470,7 @@ impl Window {
     ///
     /// [safe area]: https://developer.apple.com/documentation/uikit/uiview/2891103-safeareainsets?language=objc
     #[inline]
-    pub fn inner_size(&self) -> PhysicalSize {
+    pub fn inner_size(&self) -> PhysicalSize<u32> {
         self.window.inner_size()
     }
 
@@ -498,7 +498,7 @@ impl Window {
     /// - **iOS:** Can only be called on the main thread. Returns the `PhysicalSize` of the window in
     ///   screen space coordinates.
     #[inline]
-    pub fn outer_size(&self) -> PhysicalSize {
+    pub fn outer_size(&self) -> PhysicalSize<u32> {
         self.window.outer_size()
     }