Make VarArg methods return types show up as Variant in API json

VarArg methods have the return type Object in the API json for GDNative. This
can cause undefined behavior in some language bindings due to lack of
documentation on VarArg methods' behavior.

This changes the MethodInfo of:

- CSharpScript::_new
- GDScript::_new
- PluginScript::_new

modules/gdnative/nativescript/nativescript.cpp

@@ -79,7 +79,7 @@ void NativeScript::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "script_class_name"), "set_script_class_name", "get_script_class_name");
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "script_class_icon_path", PROPERTY_HINT_FILE), "set_script_class_icon_path", "get_script_class_icon_path");
 
-	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &NativeScript::_new, MethodInfo(Variant::OBJECT, "new"));
+	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &NativeScript::_new, MethodInfo("new"));
 }
 
 #define NSL NativeScriptLanguage::get_singleton()

modules/gdnative/pluginscript/pluginscript_script.cpp

@@ -50,7 +50,7 @@
 #endif
 
 void PluginScript::_bind_methods() {
-	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &PluginScript::_new, MethodInfo(Variant::OBJECT, "new"));
+	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &PluginScript::_new, MethodInfo("new"));
 }
 
 PluginScriptInstance *PluginScript::_create_instance(const Variant **p_args, int p_argcount, Object *p_owner, Variant::CallError &r_error) {

modules/gdscript/gdscript.cpp

@@ -710,7 +710,7 @@ void GDScript::_get_property_list(List<PropertyInfo> *p_properties) const {
 
 void GDScript::_bind_methods() {
 
-	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &GDScript::_new, MethodInfo(Variant::OBJECT, "new"));
+	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &GDScript::_new, MethodInfo("new"));
 
 	ClassDB::bind_method(D_METHOD("get_as_byte_code"), &GDScript::get_as_byte_code);
 }

modules/mono/csharp_script.cpp

@@ -2661,7 +2661,7 @@ void CSharpScript::_get_property_list(List<PropertyInfo> *p_properties) const {
 
 void CSharpScript::_bind_methods() {
 
-	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &CSharpScript::_new, MethodInfo(Variant::OBJECT, "new"));
+	ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "new", &CSharpScript::_new, MethodInfo("new"));
 }
 
 Ref<CSharpScript> CSharpScript::create_for_managed_type(GDMonoClass *p_class, GDMonoClass *p_native) {