Move files to subdirectories (#6599)

* Move files around

src/mapgen/mapgen_singlenode.h

@@ -0,0 +1,49 @@
+/*
+Minetest
+Copyright (C) 2013-2015 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2013-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+Copyright (C) 2015-2017 paramat
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include "mapgen.h"
+
+struct MapgenSinglenodeParams : public MapgenParams
+{
+	MapgenSinglenodeParams() = default;
+	~MapgenSinglenodeParams() = default;
+
+	void readParams(const Settings *settings) {}
+	void writeParams(Settings *settings) const {}
+};
+
+class MapgenSinglenode : public Mapgen
+{
+public:
+	u32 flags;
+	content_t c_node;
+	u8 set_light;
+
+	MapgenSinglenode(int mapgenid, MapgenParams *params, EmergeManager *emerge);
+	~MapgenSinglenode() = default;
+
+	virtual MapgenType getType() const { return MAPGEN_SINGLENODE; }
+
+	void makeChunk(BlockMakeData *data);
+	int getSpawnLevelAtPoint(v2s16 p);
+};