[Bleeding] Add ways to retrieve and delete crafting recipes and fixed some issues with the existing recipe API.

- New recipe iterator which enables deleting specific recipes
- Functions to delete all recipes or revert to vanilla recipe set
- Fixed the recipes API; you should now be able to define recipes that take brewed potions!
- Fetch all recipes that result in a specific item

By: Celtic Minstrel <celtic.minstrel.ca@some.place>

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -1,6 +1,7 @@
 package org.bukkit;
 
 import java.io.File;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -11,6 +12,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.command.ConsoleCommandSender;
 import org.bukkit.command.PluginCommand;
 import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.Recipe;
 import org.bukkit.map.MapView;
 import org.bukkit.plugin.PluginManager;
@@ -192,6 +194,22 @@ public final class Bukkit {
         return server.addRecipe(recipe);
     }
 
+    public List<Recipe> getRecipesFor(ItemStack result) {
+        return server.getRecipesFor(result);
+    }
+
+    public Iterator<Recipe> recipeIterator() {
+        return server.recipeIterator();
+    }
+
+    public void clearRecipes() {
+        server.clearRecipes();
+    }
+
+    public void resetRecipes() {
+        server.resetRecipes();
+    }
+
     public static Map<String, String[]> getCommandAliases() {
         return server.getCommandAliases();
     }