Changed test project type to WIndows 8.1

Changed test project framework from Nunit to MSTest
Changed HashAlgorithm from BouncyCastle to WinRT crypto
WIP progress bar in opendatabaseusercontrol
TextBox with button made generic
WIP implement copy on button click in Entry Page

ModernKeePassLib/Cryptography/Hash/SHA256Managed.cs

@@ -1,12 +1,9 @@
-using Org.BouncyCastle.Crypto.Digests;
+using Windows.Security.Cryptography.Core;
 
 namespace ModernKeePassLib.Cryptography.Hash
 {
     public class SHA256Managed : HashAlgorithm
     {
-        public SHA256Managed()
-        {
-            Digest = new Sha256Digest();
-        }
+        public SHA256Managed() : base(HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha256).CreateHash()) {}
     }
 }