Add spawn and respawn to /goto command

mods/sf_world/init.lua

@@ -592,7 +592,7 @@ end)
 
 minetest.register_chatcommand("goto", {
 	privs = { teleport = true },
-	params = S("<destination>"),
+	params = S("<destination> | spawn | respawn"),
 	description = S("Teleport to a destination"),
 	func = function(name, param)
 		local player = minetest.get_player_by_name(name)
@@ -601,10 +601,25 @@ minetest.register_chatcommand("goto", {
 		end
 		if param == "" then
 			return false
+		elseif param == "spawn" then
+			sf_world.go_to_spawn_pos(player)
+			return true
+		elseif param == "respawn" then
+			sf_world.go_to_respawn_pos(player)
+			return true
 		end
 		local destination = tonumber(param)
 		if not destination or not sf_world.teleport_destinations[destination] then
-			return false, S("Invalid destination! Destination must be a number between 1 and @1.", #sf_world.teleport_destinations)
+			local destlist = {}
+			for k,v in pairs(sf_world.teleport_destinations) do
+				table.insert(destlist, k)
+			end
+			table.sort(destlist)
+			table.insert(destlist, "spawn")
+			table.insert(destlist, "respawn")
+			-- separate list with commas
+			local destlist_txt = table.concat(destlist, S(", "))
+			return false, S("Invalid destination! Valid destinations are: @1.", destlist_txt)
 		else
 			sf_world.teleport_to_destination(player, destination)
 			return true