Small ResourceManager refactor, add ResourceSaver<T>.

DaggerFramework/Source/Resources/Resource.cs

@@ -1,10 +1,15 @@
+using System.Text.Json.Serialization;
+
 namespace DaggerFramework
 {
     public abstract class Resource : IDisposable
     {
         public string? Path { get => _path; set => _path = value; }
+
+        [JsonIgnore]
         public byte[]? Buffer { get => _buffer; set => _buffer = value; }
 
+        [JsonIgnore]
         public long BufferSize { get; set; }
 
         public Resource(string path, byte[] buffer)