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/SHA512Managed.cs

@@ -1,12 +1,9 @@
-using Org.BouncyCastle.Crypto.Digests;
+using Windows.Security.Cryptography.Core;
 
 namespace ModernKeePassLib.Cryptography.Hash
 {
     public class SHA512Managed: HashAlgorithm
     {
-        public SHA512Managed()
-        {
-            Digest = new Sha512Digest();
-        }
+        public SHA512Managed() : base(HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha512).CreateHash()) {}
     }
 }