Missing event listeners and error catches on some LoadingItems

[divillysausages]

Some of the LoadingItems are missing event listeners relating to security, meaning that if there was a problem, the SWF will crash (and if you're using the debug player, you get a nice dialog box).

To change:
ImageItem:
loader.contentLoaderInfo.addEventListener(AsyncErrorEvent.ASYNC_ERROR, onErrorHandler, false, 0, true);
URLItem
loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, super.onSecurityErrorHandler, false, 0, true);

Include the relevant removeEventListener() as well

Also, as most of the load() calls on the respective loaders throw different errors, at the minute, most of them only catch SecurityError, meaning if another was thrown, same problem, the SWF crashes.

For all LoadingItems, replace:
}catch( se : SecurityError){ onSecurityErrorHandler(_createErrorEvent(se)); }

with:

}catch( se : SecurityError){ onSecurityErrorHandler(_createErrorEvent(se)); }catch ( e:Error) { onErrorHandler(_createErrorEvent(e)); }