feat(Metal): Add support to disable display sleep (no screen saver)

ui/drivers/cocoa/cocoa_common.h

@@ -60,6 +60,10 @@ typedef enum apple_view_type {
 /*! @brief setCursorVisible specifies whether the cursor is visible */
 - (void)setCursorVisible:(bool)v;
 
+/*! @brief controls whether the screen saver should be disabled and
+ * the displays should not sleep.
+ */
+- (bool)setDisableDisplaySleep:(bool)disable;
 @end
 
 extern id<ApplePlatform> apple_platform;

ui/drivers/ui_cocoa.m

@@ -53,6 +53,8 @@ id<ApplePlatform> apple_platform;
    NSWindow* _window;
    apple_view_type_t _vt;
    NSView* _renderView;
+   id _sleepActivity;
+   
 }
 
 @property (nonatomic, retain) NSWindow IBOutlet* window;
@@ -337,6 +339,26 @@ static char** waiting_argv;
       [NSCursor hide];
 }
 
+- (bool)setDisableDisplaySleep:(bool)disable
+{
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_9
+   if (disable && _sleepActivity == nil)
+   {
+      _sleepActivity = [NSProcessInfo.processInfo beginActivityWithOptions:NSActivityIdleDisplaySleepDisabled reason:@"disable screen saver"];
+   }
+   else if (!disable && _sleepActivity != nil)
+   {
+      [NSProcessInfo.processInfo endActivity:_sleepActivity];
+      _sleepActivity = nil;
+   }
+   return YES;
+#else
+   return NO;
+#endif
+
+}
+
+
 - (void) rarch_main
 {
     do