eframe: Use objc2 and its framework crates (#4395)

These are a replacement to the `objc` and `cocoa` crates.

This PR prevents:
- An extra copy when creating `NSData`
- A memory leak when creating `NSImage`
- A memory leak when creating `NSString`

And is generally a readability improvement.

Note that we define `NSApp` manually for now, the implementation in
`objc2-app-kit` is currently suboptimal and wouldn't allow you to check
whether the NSApplication has been created or not.

Related: https://github.com/emilk/egui/issues/4219, this should nicely
coincide with the Winit `0.30` release.

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

Cargo.lock

@@ -548,7 +548,7 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2dd7cf50912cddc06dc5ea7c08c5e81c1b2c842a70d19def1848d54c586fed92"
 dependencies = [
- "objc-sys 0.3.1",
+ "objc-sys 0.3.3",
 ]
 
 [[package]]
@@ -571,6 +571,15 @@ dependencies = [
  "objc2 0.4.1",
 ]
 
+[[package]]
+name = "block2"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43ff7d91d3c1d568065b06c899777d1e48dcf76103a672a0adbc238a7f247f1e"
+dependencies = [
+ "objc2 0.5.1",
+]
+
 [[package]]
 name = "blocking"
 version = "1.4.0"
@@ -795,36 +804,6 @@ dependencies = [
  "error-code",
 ]
 
-[[package]]
-name = "cocoa"
-version = "0.25.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6140449f97a6e97f9511815c5632d84c8aacf8ac271ad77c559218161a1373c"
-dependencies = [
- "bitflags 1.3.2",
- "block",
- "cocoa-foundation",
- "core-foundation",
- "core-graphics",
- "foreign-types",
- "libc",
- "objc",
-]
-
-[[package]]
-name = "cocoa-foundation"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c6234cbb2e4c785b456c0644748b1ac416dd045799740356f8363dfe00c93f7"
-dependencies = [
- "bitflags 1.3.2",
- "block",
- "core-foundation",
- "core-graphics-types",
- "libc",
- "objc",
-]
-
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -1201,7 +1180,6 @@ name = "eframe"
 version = "0.27.2"
 dependencies = [
  "bytemuck",
- "cocoa",
  "directories-next",
  "document-features",
  "egui",
@@ -1214,7 +1192,9 @@ dependencies = [
  "image",
  "js-sys",
  "log",
- "objc",
+ "objc2 0.5.1",
+ "objc2-app-kit",
+ "objc2-foundation",
  "parking_lot",
  "percent-encoding",
  "pollster",
@@ -2599,9 +2579,9 @@ checksum = "df3b9834c1e95694a05a828b59f55fa2afec6288359cda67146126b3f90a55d7"
 
 [[package]]
 name = "objc-sys"
-version = "0.3.1"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99e1d07c6eab1ce8b6382b8e3c7246fe117ff3f8b34be065f5ebace6749fe845"
+checksum = "da284c198fb9b7b0603f8635185e85fbd5b64ee154b1ed406d489077de2d6d60"
 
 [[package]]
 name = "objc2"
@@ -2620,10 +2600,43 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "559c5a40fdd30eb5e344fbceacf7595a81e242529fb4e21cf5f43fb4f11ff98d"
 dependencies = [
- "objc-sys 0.3.1",
+ "objc-sys 0.3.3",
  "objc2-encode 3.0.0",
 ]
 
+[[package]]
+name = "objc2"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4b25e1034d0e636cd84707ccdaa9f81243d399196b8a773946dcffec0401659"
+dependencies = [
+ "objc-sys 0.3.3",
+ "objc2-encode 4.0.1",
+]
+
+[[package]]
+name = "objc2-app-kit"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb79768a710a9a1798848179edb186d1af7e8a8679f369e4b8d201dd2a034047"
+dependencies = [
+ "block2 0.5.0",
+ "objc2 0.5.1",
+ "objc2-core-data",
+ "objc2-foundation",
+]
+
+[[package]]
+name = "objc2-core-data"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e092bc42eaf30a08844e6a076938c60751225ec81431ab89f5d1ccd9f958d6c"
+dependencies = [
+ "block2 0.5.0",
+ "objc2 0.5.1",
+ "objc2-foundation",
+]
+
 [[package]]
 name = "objc2-encode"
 version = "2.0.0-pre.2"
@@ -2639,6 +2652,22 @@ version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d079845b37af429bfe5dfa76e6d087d788031045b25cfc6fd898486fd9847666"
 
+[[package]]
+name = "objc2-encode"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88658da63e4cc2c8adb1262902cd6af51094df0488b760d6fd27194269c0950a"
+
+[[package]]
+name = "objc2-foundation"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfaefe14254871ea16c7d88968c0ff14ba554712a20d76421eec52f0a7fb8904"
+dependencies = [
+ "block2 0.5.0",
+ "objc2 0.5.1",
+]
+
 [[package]]
 name = "objc_exception"
 version = "0.1.2"