Simplified process startup on macOS and Linux

Apple/Shared/Constants/Constants.h

@@ -0,0 +1,11 @@
+#import <Foundation/Foundation.h>
+
+#define MACRO_STRING_(m) #m
+#define MACRO_STRING(m) @MACRO_STRING_(m)
+
+NS_ASSUME_NONNULL_BEGIN
+
+static NSString * const AppBundleIdentifier = MACRO_STRING(APP_BUNDLE_IDENTIFIER);
+static NSString * const AppGroupIdentifier = MACRO_STRING(APP_GROUP_IDENTIFIER);
+
+NS_ASSUME_NONNULL_END

Apple/Shared/Constants/module.modulemap

@@ -0,0 +1,4 @@
+module Constants {
+    header "Constants.h"
+    export *
+}