A craftguide for [sfinv](https://github.com/rubenwardy/sfinv), adding a recipe-tab whose recipes are revealed progressively — only recipes whose ingredients have been discovered are visible. This helps to not overwhelm the player, and instill a sense of exploration.
Inspired by [i3](https://github.com/minetest-mods/i3). Based on [minetest-game](https://github.com/minetest/minetest_game)’s [mtg_craftguide](https://github.com/minetest/minetest_game/tree/master/mods/mtg_craftguide), which in turn is based on [craftguide](https://github.com/minetest-mods/craftguide). This will remain a simple patched version of mtg_craftguide; I hope to keep up-to-date with upstream.
