Update objc2 crates (#3634)

Changes relevant to Winit:
- `icrate` has been deprecated in favour of separate crates per
  framework, in our case `objc2-foundation` and `objc2-app-kit` (and in
  the future `objc2-ui-kit` on iOS).
- Moved `MainThreadMarker::run_on_main` to free-standing function
  `run_on_main`.
- Changed how features work, this should result in less code that we
  need to compile.
- Enums are now real structs instead of type-aliases and free constants.

src/platform_impl/ios/uikit/application.rs

@@ -1,6 +1,6 @@
-use icrate::Foundation::{CGRect, MainThreadMarker, NSArray, NSObject};
 use objc2::rc::Id;
 use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
+use objc2_foundation::{CGRect, MainThreadMarker, NSArray, NSObject};
 
 use super::{UIResponder, UIWindow};
 

src/platform_impl/ios/uikit/coordinate_space.rs

@@ -1,5 +1,5 @@
-use icrate::Foundation::NSObject;
 use objc2::{extern_class, mutability, ClassType};
+use objc2_foundation::NSObject;
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/uikit/device.rs

@@ -1,7 +1,7 @@
-use icrate::Foundation::{MainThreadMarker, NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
 use objc2::rc::Id;
 use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
+use objc2_foundation::{MainThreadMarker, NSInteger, NSObject};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/uikit/event.rs

@@ -1,5 +1,5 @@
-use icrate::Foundation::NSObject;
 use objc2::{extern_class, mutability, ClassType};
+use objc2_foundation::NSObject;
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/uikit/geometry.rs

@@ -1,5 +1,5 @@
-use icrate::Foundation::NSUInteger;
 use objc2::encode::{Encode, Encoding};
+use objc2_foundation::NSUInteger;
 
 #[repr(transparent)]
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]

src/platform_impl/ios/uikit/gesture_recognizer.rs

@@ -1,8 +1,8 @@
-use icrate::Foundation::{CGFloat, NSInteger, NSObject, NSUInteger};
 use objc2::{
     encode::{Encode, Encoding},
     extern_class, extern_methods, mutability, ClassType,
 };
+use objc2_foundation::{CGFloat, NSInteger, NSObject, NSUInteger};
 
 // https://developer.apple.com/documentation/uikit/uigesturerecognizer
 extern_class!(

src/platform_impl/ios/uikit/mod.rs

@@ -3,7 +3,7 @@
 
 use std::os::raw::{c_char, c_int};
 
-use icrate::Foundation::NSString;
+use objc2_foundation::NSString;
 
 mod application;
 mod coordinate_space;

src/platform_impl/ios/uikit/responder.rs

@@ -1,5 +1,5 @@
-use icrate::Foundation::NSObject;
 use objc2::{extern_class, mutability, ClassType};
+use objc2_foundation::NSObject;
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/uikit/screen.rs

@@ -1,7 +1,7 @@
-use icrate::Foundation::{CGFloat, CGRect, MainThreadMarker, NSArray, NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
 use objc2::rc::Id;
 use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
+use objc2_foundation::{CGFloat, CGRect, MainThreadMarker, NSArray, NSInteger, NSObject};
 
 use super::{UICoordinateSpace, UIScreenMode};
 

src/platform_impl/ios/uikit/screen_mode.rs

@@ -1,5 +1,5 @@
-use icrate::Foundation::{CGSize, NSObject};
 use objc2::{extern_class, extern_methods, mutability, ClassType};
+use objc2_foundation::{CGSize, NSObject};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/uikit/status_bar_style.rs

@@ -1,5 +1,5 @@
-use icrate::Foundation::NSInteger;
 use objc2::encode::{Encode, Encoding};
+use objc2_foundation::NSInteger;
 
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
 #[allow(dead_code)]

src/platform_impl/ios/uikit/touch.rs

@@ -1,6 +1,6 @@
-use icrate::Foundation::{CGFloat, CGPoint, NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
 use objc2::{extern_class, extern_methods, mutability, ClassType};
+use objc2_foundation::{CGFloat, CGPoint, NSInteger, NSObject};
 
 use super::UIView;
 

src/platform_impl/ios/uikit/trait_collection.rs

@@ -1,6 +1,6 @@
-use icrate::Foundation::{NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
 use objc2::{extern_class, extern_methods, mutability, ClassType};
+use objc2_foundation::{NSInteger, NSObject};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/uikit/view.rs

@@ -1,7 +1,7 @@
-use icrate::Foundation::{CGFloat, CGRect, NSObject};
 use objc2::encode::{Encode, Encoding};
 use objc2::rc::Id;
 use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
+use objc2_foundation::{CGFloat, CGRect, NSObject};
 
 use super::{UICoordinateSpace, UIGestureRecognizer, UIResponder, UIViewController};
 

src/platform_impl/ios/uikit/view_controller.rs

@@ -1,7 +1,7 @@
-use icrate::Foundation::{NSObject, NSUInteger};
 use objc2::encode::{Encode, Encoding};
 use objc2::rc::Id;
 use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
+use objc2_foundation::{NSObject, NSUInteger};
 
 use super::{UIResponder, UIView};
 

src/platform_impl/ios/uikit/window.rs

@@ -1,6 +1,6 @@
-use icrate::Foundation::NSObject;
 use objc2::rc::Id;
 use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
+use objc2_foundation::NSObject;
 
 use super::{UIResponder, UIScreen, UIView};