Engine: * Added possibility to fade the screen in/out using black or white * Added flash effect to screenshot key * Added fade in for round start * Added fade out for round end * Goal display now ignores first tick. So long loading times no longer "eat" their visibility time.

//
// Prefix header for all source files of the 'OpenGL ES app' target in the 'OpenGL ES app' project
//

#ifdef __OBJC__
#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>
#import <UIKit/UIKit.h>
#endif