Move scriptapi to separate folder (by sapier)

On the lua side, notably minetest.env:<function>(<args>) should now
be replaced by minetest.<function>(<args>).
The old way is and will stay supported for a long time.

Also:
Update and clean up lua_api.txt (by celeron55)
Move EnvRef to lua and remove add_rat and add_firefly (by kahrl)
Add separate src/util/CMakeLists.txt, other minor fixes (by kahrl)

src/script/lua_api/l_inventory.h

@@ -0,0 +1,137 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+*/
+
+#ifndef L_INVENTORY_H_
+#define L_INVENTORY_H_
+
+extern "C" {
+#include <lua.h>
+#include <lauxlib.h>
+}
+
+#include "inventorymanager.h"
+#include "player.h"
+#include "serverobject.h"
+#include "inventory.h"
+
+#include "lua_api/l_base.h"
+/*
+	InvRef
+*/
+
+class InvRef
+{
+private:
+	InventoryLocation m_loc;
+
+	static const char className[];
+	static const luaL_reg methods[];
+
+	static InvRef *checkobject(lua_State *L, int narg);
+
+	static Inventory* getinv(lua_State *L, InvRef *ref);
+
+	static InventoryList* getlist(lua_State *L, InvRef *ref,
+			const char *listname);
+
+	static void reportInventoryChange(lua_State *L, InvRef *ref);
+
+	// Exported functions
+
+	// garbage collector
+	static int gc_object(lua_State *L);
+
+	// is_empty(self, listname) -> true/false
+	static int l_is_empty(lua_State *L);
+
+	// get_size(self, listname)
+	static int l_get_size(lua_State *L);
+
+	// get_width(self, listname)
+	static int l_get_width(lua_State *L);
+
+	// set_size(self, listname, size)
+	static int l_set_size(lua_State *L);
+
+	// set_width(self, listname, size)
+	static int l_set_width(lua_State *L);
+
+	// get_stack(self, listname, i) -> itemstack
+	static int l_get_stack(lua_State *L);
+
+	// set_stack(self, listname, i, stack) -> true/false
+	static int l_set_stack(lua_State *L);
+
+	// get_list(self, listname) -> list or nil
+	static int l_get_list(lua_State *L);
+
+	// set_list(self, listname, list)
+	static int l_set_list(lua_State *L);
+
+	// add_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
+	// Returns the leftover stack
+	static int l_add_item(lua_State *L);
+
+	// room_for_item(self, listname, itemstack or itemstring or table or nil) -> true/false
+	// Returns true if the item completely fits into the list
+	static int l_room_for_item(lua_State *L);
+
+	// contains_item(self, listname, itemstack or itemstring or table or nil) -> true/false
+	// Returns true if the list contains the given count of the given item name
+	static int l_contains_item(lua_State *L);
+
+	// remove_item(self, listname, itemstack or itemstring or table or nil) -> itemstack
+	// Returns the items that were actually removed
+	static int l_remove_item(lua_State *L);
+
+	// get_location() -> location (like minetest.get_inventory(location))
+	static int l_get_location(lua_State *L);
+
+public:
+	InvRef(const InventoryLocation &loc);
+
+	~InvRef();
+
+	// Creates an InvRef and leaves it on top of stack
+	// Not callable from Lua; all references are created on the C side.
+	static void create(lua_State *L, const InventoryLocation &loc);
+	static void createPlayer(lua_State *L, Player *player);
+	static void createNodeMeta(lua_State *L, v3s16 p);
+	static void Register(lua_State *L);
+};
+
+class ModApiInventory
+	: public ModApiBase
+{
+public:
+	ModApiInventory();
+
+	bool Initialize(lua_State *L, int top);
+
+	static int l_create_detached_inventory_raw(lua_State *L);
+	static int l_get_inventory(lua_State *L);
+private:
+	static void inventory_set_list_from_lua(Inventory *inv, const char *name,
+			lua_State *L, int tableindex, int forcesize);
+	static void inventory_get_list_to_lua(Inventory *inv, const char *name,
+			lua_State *L);
+
+};
+
+#endif /* L_INVENTORY_H_ */