Ability to set autoloads as singleton global variables

modules/gdscript/gd_script.cpp

@@ -2570,6 +2570,12 @@ void GDScriptLanguage::_add_global(const StringName& p_name,const Variant& p_val
 	_global_array=global_array.ptr();
 }
 
+void GDScriptLanguage::add_global_constant(const StringName& p_variable,const Variant& p_value) {
+
+	_add_global(p_variable,p_value);
+}
+
+
 void GDScriptLanguage::init() {