Change naming from Derp -> OneSix until the new instance type supports legacy

logic/OneSixInstance_p.h

@@ -0,0 +1,27 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BaseInstance_p.h"
+#include "OneSixVersion.h"
+#include "ModList.h"
+
+struct OneSixInstancePrivate : public BaseInstancePrivate
+{
+	std::shared_ptr<OneSixVersion> version;
+	std::shared_ptr<ModList> loader_mod_list;
+	std::shared_ptr<ModList> resource_pack_list;
+};