improve ips.ui.alert

I would suggest improvements for ips.ui.alert:

- create a instance programmatically like for dialog:

var dialog = ips.ui.dialog.create( object options );
dialog.show(true);//initonly

- get a instance like ips.ui.dialog.getObj;

- alert id how dialog.dialogID do;

- update content inside alert (like ips.ui.dialog.updateContent);