Update ObjC formatting to look more similar to the C++

Also update the auto formatter to run on *.m and *.mm files, and effectively ban breaking on return types entirely, as I think this is ugly.

Diffs=
c7d125c7d Update ObjC formatting to look more similar to the C++

.rive_head

@@ -1 +1 @@
-a61f4c6b55916294a69226fbd8312b602ad37466
+c7d125c7d4efe1233c16c2a95fb7b637b746b010

example/ios/Runner/AppDelegate.m

@@ -4,7 +4,8 @@
 @implementation AppDelegate
 
 - (BOOL)application:(UIApplication*)application
-    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
+{
     [GeneratedPluginRegistrant registerWithRegistry:self];
     // Override point for customization after application launch.
     return [super application:application didFinishLaunchingWithOptions:launchOptions];

example/ios/Runner/main.m

@@ -2,8 +2,10 @@
 #import <UIKit/UIKit.h>
 #import "AppDelegate.h"
 
-int main(int argc, char* argv[]) {
+int main(int argc, char* argv[])
-  @autoreleasepool {
+{
+    @autoreleasepool
+    {
         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
     }
 }