Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
2c6b1f048 Revert "Remove itneract event from boat" (Fixes #5677)
aae1c54a9 Add command line option to load extra plugin jars not in the plugins folder
322886c86 Avoid NPE due to PlayerBedFailEnterEvent
d3c9a195c removed duplicate ProjectileHitEvent for fireball (#5671)
7989028a5 More Enchantment API (#5588)
c0cb5c129 Adds methods for checking item repairability (#5651)
22399b07f Actually use extended/ambient in BeaconEffectEvent (#5647)
979135878 Add cause and cancel message to PlayerGameModeChangeEvent (#5638)
51e1e58d2 Fix Adventure support in UnknownCommandEvent (#5664)
45e19ffb0 [Auto] Updated Upstream (CraftBukkit)
151457628 Fix Counter#decrement recursive call (#5665)
21ac7dc98 [Auto] Updated Upstream (CraftBukkit)
18ad2c9dd Add environment variable (PAPER_DISABLE_SERVER_GUI) to disable server gui

patches/api/0019-ItemStack-convenience-methods.patch

@@ -50,7 +50,7 @@ index 9b1c9e60dba9ea3ef8d8e164f13dd76daf57db8e..b04e9de7183f00a9a47c1fce26895c83
 +    // Purpur end
  }
 diff --git a/src/main/java/org/bukkit/inventory/ItemStack.java b/src/main/java/org/bukkit/inventory/ItemStack.java
-index fccfae41f53a175e1a6a670c793e464456de6b60..54af7fb0b5eaeffc7ec05dd58028bf927f71bb9e 100644
+index 0f8c593ae9bca46081f0b22c2d763a2699175398..ff17e3165beedee235c738ebc8e9c9f1a7ab52ca 100644
 --- a/src/main/java/org/bukkit/inventory/ItemStack.java
 +++ b/src/main/java/org/bukkit/inventory/ItemStack.java
 @@ -17,6 +17,18 @@ import org.bukkit.inventory.meta.ItemMeta;
@@ -72,8 +72,8 @@ index fccfae41f53a175e1a6a670c793e464456de6b60..54af7fb0b5eaeffc7ec05dd58028bf92
  
  /**
   * Represents a stack of items.
-@@ -874,4 +886,626 @@ public class ItemStack implements Cloneable, ConfigurationSerializable, net.kyor
-         return Bukkit.getUnsafe().getItemStackRarity(this);
+@@ -896,4 +908,626 @@ public class ItemStack implements Cloneable, ConfigurationSerializable, net.kyor
+         return Bukkit.getUnsafe().isValidRepairItemStack(toBeRepaired, this);
      }
      // Paper end
 +