[TIMOB-9332] iOS: Map - Add centerOffset property to Ti.Map.Annotation

   var win = Ti.UI.createWindow({});
   
   var mapView = Ti.Map.createView({
       height : '100%',
       width : '100%',
       mapType : Titanium.Map.STANDARD_TYPE,
   });
   
   var route = {
       color : "#000000",
       name : "route",
       points : [{latitude: 0, longitude: 0},{latitude: 30, longitude: 30}],
       width : 12
   };
   mapView.addRoute(route);
   
   var annotation0 = Ti.Map.createAnnotation({
       latitude: 0,
       longitude: 0,
       image: "image.png",
       title: "pin",
       //centerOffset: {x: 0, y: -24}
   });
   //This also works
   annotation0.setCenterOffset({x: 0, y: -24});
   
   mapView.addAnnotation(annotation0);
   win.add(mapView);
   win.open();
   

   var win = Titanium.UI.createWindow();
   
   var mountainView = Titanium.Map.createAnnotation({
       latitude:37.390749,
       longitude:-122.081651,
       title:"Appcelerator Headquarters",
       subtitle:'Mountain View, CA',
       pincolor:Titanium.Map.ANNOTATION_RED,
       animate:true,
       leftButton: 'images/appcelerator_small.png',
       myid:1 // Custom property to uniquely identify this annotation.
   });
   
   var mapview = Titanium.Map.createView({
       mapType: Titanium.Map.STANDARD_TYPE,
       region: {latitude:37.390749, longitude:-122.081651,
               latitudeDelta:0.01, longitudeDelta:0.01},
       animate:true,
       regionFit:true,
       userLocation:true,
       annotations:[mountainView]
   });
   
   var container1 = Ti.UI.createView({
       height:Ti.UI.SIZE,
       top:0
   })
   
   var container2 = Ti.UI.createView({
       height:Ti.UI.SIZE,
       bottom:0
   })
   
   
   
   win.add(mapview);
   
   win.add(container1);
   win.add(container2);
   
   var b1 = Ti.UI.createButton({
       title:'OFFSET 0,0',
       left:0
   })
   
   var b2 = Ti.UI.createButton({
       title:'OFFSET 0,24',
       right:0
   })
   
   var b3 = Ti.UI.createButton({
       title:'OFFSET 0,-24',
       left:0
   })
   
   var b4 = Ti.UI.createButton({
       title:'OFFSET -24,24',
       right:0
   })
   
   container1.add(b1);
   container1.add(b2);
   
   container2.add(b3);
   container2.add(b4);
   
   b1.addEventListener('click',function(e){
       Ti.API.info('SET CENTEROFFSET WITH PROP TO 0,0');
       mountainView.centerOffset = {x:0,y:0};
   })
   
   b2.addEventListener('click',function(e){
       Ti.API.info('SET CENTEROFFSET WITH PROP TO 0,24');
       mountainView.centerOffset = {x:0,y:24};
   })
   
   b3.addEventListener('click',function(e){
       Ti.API.info('SET CENTEROFFSET WITH METHOD TO 0,-24');
       mountainView.setCenterOffset({x:0,y:-24})
   })
   
   b4.addEventListener('click',function(e){
       Ti.API.info('SET CENTEROFFSET WITH METHOD TO -24,24');
       mountainView.setCenterOffset({x:-24,y:24})
   })
   
   
   win.open();