#33 Automatically expand path variables for clsFile

[Jason Ely]

For class vdk.io.clsFile, automatically expand environment variables if the file string contains them.

Users can then pass in strings as in the following %tmp%\test.txt . the clsFile class will automatically expand with the result being "C:\Users\Jason\AppData\Local\Temp\test.txt"

The value of the expanded variable will vary from machine to machine.

[Jason Ely]

Dev done