fix(codegen): Fixes various code gen issues. Adds better embedded serialization support (#688)

* Adds save flag support (see `ElvenGlasses` for an example)
* Updates AOSAttributes so they are code genned
* Fixes embedded object support by adding an `IRawSerializable`
* Fixes various inconsistencies in serializing with codegen

Projects/SerializationGenerator/SerializableMigration/SerializableProperty.cs

@@ -25,6 +25,9 @@ namespace SerializableMigration
         [JsonPropertyName("type")]
         public string Type { get; init; }
 
+        [JsonPropertyName("usesSaveFlag")]
+        public bool? UsesSaveFlag { get; init; }
+
         [JsonPropertyName("rule")]
         public string Rule { get; init; }