Proper serialization of ItemStack and other Serializable stuff in Bukkit API

pandalib-core/src/main/java/fr/pandacube/lib/core/json/Json.java

@@ -52,6 +52,7 @@ public class Json {
 	private static Gson build(Function<GsonBuilder, GsonBuilder> builderModifier) {
 		GsonBuilder base = new GsonBuilder()
 				.registerTypeAdapterFactory(new CustomAdapterFactory())
+				.disableHtmlEscaping()
 				.setLenient();
 		return builderModifier.apply(base).create();
 	}