Messagepack (#12)

* add messagepack attributes

* fix isnullorempty

* bump api version

---------

Co-authored-by: rootdarkarchon <root.darkarchon@outlook.com>

MareSynchronosAPI/Data/FileReplacementData.cs

@@ -1,5 +1,8 @@
-namespace MareSynchronos.API.Data;
+using MessagePack;
 
+namespace MareSynchronos.API.Data;
+
+[MessagePackObject(keyAsPropertyName: true)]
 public class FileReplacementData : HashableDataBase
 {
     public string[] GamePaths { get; set; } = Array.Empty<string>();