implement save request on OSX, add Quick Look extentions

PanoPainter-OSX/main.h

@@ -3,13 +3,21 @@
 #include <CoreVideo/CoreVideo.h>
 #include <OpenGL/OpenGL.h>
 
+@interface Window : NSWindow
+@end
+
+@interface Controller : NSWindowController<NSWindowDelegate>
+@end
+
 @interface View : NSOpenGLView
 {
+    @public Window* wnd;
     CVDisplayLinkRef dl;
     NSOpenGLContext* glctx;
     _CGLContextObject* cgl;
     bool gl_ready;
 }
+- (void)close;
 - (void)terminateGL;
 - (void)async_lock;
 - (void)async_unlock;