Use C99 designated initializers for all QuickJS class def members.

src/Generator/Generators/QuickJS/QuickJSSources.cs

@@ -320,7 +320,7 @@ namespace CppSharp.Generators.Cpp
                     WriteLine($"static JSClassDef classDef_{GetCIdentifier(Context, @class)}");
                     WriteOpenBraceAndIndent();
 
-                    WriteLine($"\"{@class.Name}\",");
+                    WriteLine($".class_name = \"{@class.Name}\",");
                     WriteLine($".finalizer = {finalizerId}");
 
                     Unindent();

src/Generator/Generators/QuickJS/Runtime/Signal.cpp

@@ -153,12 +153,11 @@ void finalizer__Signal(JSRuntime *rt, JSValue val)
     js_free_rt(rt, signalCtx);
 
     JS_SetOpaque(val, nullptr);
-
 }
 
 static JSClassDef classDef__Signal
 {
-    "Signal",
+    .class_name = "Signal",
     .finalizer = finalizer__Signal
 };