Merge branch 'tptube-api' into 'master'

Expose teleport tube database API

See merge request VanessaE/pipeworks!24

teleport_tube.lua

@@ -261,3 +261,11 @@ if minetest.get_modpath("mesecons_mvps") ~= nil then
 		end
 	end)
 end
+
+-- Expose teleport tube database API for other mods
+pipeworks.tptube = {
+	hash = hash,
+	save_tube_db = save_tube_db,
+	get_db = function() return tp_tube_db or read_tube_db() end,
+	tp_tube_db_version = tp_tube_db_version
+}