Move all crates to a top-level crates folder

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/gpui/src/platform/mac.rs

@@ -0,0 +1,39 @@
+mod atlas;
+mod dispatcher;
+mod event;
+mod fonts;
+mod geometry;
+mod image_cache;
+mod platform;
+mod renderer;
+mod sprite_cache;
+mod window;
+
+use cocoa::base::{BOOL, NO, YES};
+pub use dispatcher::Dispatcher;
+pub use fonts::FontSystem;
+use platform::{MacForegroundPlatform, MacPlatform};
+use std::{rc::Rc, sync::Arc};
+use window::Window;
+
+pub(crate) fn platform() -> Arc<dyn super::Platform> {
+    Arc::new(MacPlatform::new())
+}
+
+pub(crate) fn foreground_platform() -> Rc<dyn super::ForegroundPlatform> {
+    Rc::new(MacForegroundPlatform::default())
+}
+
+trait BoolExt {
+    fn to_objc(self) -> BOOL;
+}
+
+impl BoolExt for bool {
+    fn to_objc(self) -> BOOL {
+        if self {
+            YES
+        } else {
+            NO
+        }
+    }
+}