initial macos porting work

Cargo.lock

@@ -1308,7 +1308,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a180dd8642fa45cdb7dd721cd4c11b1cadd4929ce112ebd8b9f5803cc79d536"
 dependencies = [
  "bitflags",
+ "block2",
  "dispatch2",
+ "libc",
  "objc2",
 ]
 
@@ -1325,6 +1327,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3e0adef53c21f888deb4fa59fc59f7eb17404926ee8a6f59f5df0fd7f9f3272"
 dependencies = [
  "bitflags",
+ "block2",
+ "libc",
  "objc2",
  "objc2-core-foundation",
 ]
@@ -1822,6 +1826,7 @@ dependencies = [
  "ruin-runtime",
  "ruin_reactivity",
  "ruin_ui",
+ "ruin_ui_platform_macos",
  "ruin_ui_platform_wayland",
  "tracing",
  "tracing-subscriber",
@@ -1850,6 +1855,21 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "ruin_ui_platform_macos"
+version = "0.1.0"
+dependencies = [
+ "libc",
+ "objc2",
+ "objc2-core-foundation",
+ "objc2-foundation",
+ "raw-window-handle",
+ "ruin-runtime",
+ "ruin_ui",
+ "ruin_ui_renderer_wgpu",
+ "tracing",
+]
+
 [[package]]
 name = "ruin_ui_platform_wayland"
 version = "0.1.0"