MGS V ResDec v1.0 - C# port

A port of the original "MGS V ResDec v1.0" by Sergeanur to C#.
This tool is used to decrypt (and encrypt) files from the Fox Engine.
The encrypted files have the hex header E6,EF,F8,A0.
Used in Metal Gear Solid V: The Phantom Pain, P.T., and probably in other games using the Fox Engine.