Port for macOS (#311)

* merged moonlight-mac with moonlight-ios

* reverted to the original project.pbxproj

* cleaned up the code, fixed lots of unnecessary code duplications

* multicontroller support (not tested)

* new class that can be used for further modularization of the MainFrameViewController

Moonlight macOS/Utility/keepAlive.m

@@ -0,0 +1,30 @@
+//
+//  keepAlive.m
+//  LittleHelper
+//
+//  Created by Felix Kratz on 31.10.17.
+//  Copyright © 2017 Felix Kratz. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <IOKit/pwr_mgt/IOPMLib.h>
+#import "keepAlive.h"
+
+
+@implementation keepAlive
+
+CFStringRef reasonForActivity= CFSTR("Moonlight keeps the system awake");
+IOPMAssertionID assertionID;
+
++(void) keepSystemAlive
+{
+    
+    IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep,
+                                                   kIOPMAssertionLevelOn, reasonForActivity, &assertionID);
+}
+
++(void) allowSleep
+{
+    IOPMAssertionRelease(assertionID);
+}
+@end