Added a Knowledge Book that contains all the Custom Recipes that the player can craft. The Gui displays all the ingredients (including their set variants) and results with all their meta data. So it is easier for your players to find out how use the recipes, because they can just look it up.
The Gui can be accessed via command: /cc knowledge (perm: customcrafting.cmd.knowledge) or Players can craft a newly added item. The Knowledge Book can be crafted with one Bookand one Workbench. The recipe is shapeless.
(The Knowledge Book is currently in a very early stage of development and will get more features over time!)
The algorithm that checks the ingredients of crafting recipes is now independent of the Bukkit recipes! That means the crafting recipes added to the Servers recipe list are now only used by the vanilla recipe book.
Added one more line to the error message that the player gets if using a old 1.13 Spigot/Paper build.