SoundInstance changes, small updates in Sound and Texture2d loaders.

Voile/Source/Resources/Resource.cs

@@ -4,6 +4,8 @@ namespace Voile
 {
     public abstract class Resource : IDisposable
     {
+        public Guid Guid { get; set; } = Guid.NewGuid();
+
         public string? Path { get => _path; set => _path = value; }
 
         [JsonIgnore]
@@ -16,6 +18,8 @@ namespace Voile
         {
             _path = path;
             _buffer = buffer;
+
+            BufferSize = buffer.Length;
         }
 
         public void Dispose()