Add Method to flash.filesystem.File

I think it would be a great idea to add a new method to resolve a storage directory for public application data.

Sometimes you need to save a config file, database file, or any other kind of file in a location specific to your app but not specific to a single user on a machine.

Somthing like:

var _file:File = File.applicationPublicDirectory.resolvePath('myfile.txt');

Would reference

[Windows 7]        C:\programdata\MyApp\myfile.txt

[Mac OSx]            \Library\Application Support\MyApp\myfile.txt

[Windows XP]     C:\Documents and Settings\All Users\Application Data\MyApp\myfile.txt

I have made a rough fix for my orginal problem here: http://forums.adobe.com/message/4767669

but I think this is something that should be provided by sdk