We're going on an Adventure! (#4842)

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: zml <zml@stellardrift.ca>
Co-authored-by: Mariell Hoversholm <proximyst@proximyst.com>

Spigot-Server-Patches/Restore-custom-InventoryHolder-support.patch

@@ -32,6 +32,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          return converterMap.get(type).createInventory(holder, type);
      }
  
+@@ -0,0 +0,0 @@ public final class CraftInventoryCreator {
+     // Paper end
+ 
      public Inventory createInventory(InventoryHolder holder, InventoryType type, String title) {
 +        // Paper start
 +        if (holder != null) {