Most services are implemented as command/queries

Code cleanup

ModernKeePass.Application/Cryptography/Queries/GetCompressions/GetCompressionsQuery.cs

@@ -0,0 +1,25 @@
+using System.Collections.Generic;
+using System.Linq;
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+
+namespace ModernKeePass.Application.Cryptography.Queries.GetCompressions
+{
+    public class GetCompressionsQuery : IRequest<IEnumerable<string>>
+    {
+        public class GetCompressionsQueryHandler : IRequestHandler<GetCompressionsQuery, IEnumerable<string>>
+        {
+            private readonly ICryptographyClient _cryptography;
+
+            public GetCompressionsQueryHandler(ICryptographyClient cryptography)
+            {
+                _cryptography = cryptography;
+            }
+
+            public IEnumerable<string> Handle(GetCompressionsQuery message)
+            {
+                return _cryptography.CompressionAlgorithms.OrderBy(c => c);
+            }
+        }
+    }
+}