Removed ModernKeePassLib dependency

Code cleanup
WIP on service replacement and VM use

ModernKeePass.Application/Parameters/Commands/SetCipher/SetCipherCommand.cs

@@ -0,0 +1,27 @@
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+using ModernKeePass.Domain.Exceptions;
+
+namespace ModernKeePass.Application.Parameters.Commands.SetCipher
+{
+    public class SetCipherCommand : IRequest
+    {
+        public string CipherId { get; set; }
+
+        public class SetCipherCommandHandler : IRequestHandler<SetCipherCommand>
+        {
+            private readonly IDatabaseProxy _database;
+
+            public SetCipherCommandHandler(IDatabaseProxy database)
+            {
+                _database = database;
+            }
+
+            public void Handle(SetCipherCommand message)
+            {
+                if (_database.IsOpen) _database.CipherId = message.CipherId;
+                else throw new DatabaseClosedException();
+            }
+        }
+    }
+}