Begin implementation of CheckStyle style checking

By: md_5 <git@md-5.net>

paper-server/nms-patches/PlayerInventory.patch

@@ -1,14 +1,12 @@
 --- a/net/minecraft/server/PlayerInventory.java
 +++ b/net/minecraft/server/PlayerInventory.java
-@@ -5,6 +5,15 @@
+@@ -5,6 +5,13 @@
  import java.util.List;
  import java.util.function.Predicate;
  
 +// CraftBukkit start
 +import java.util.ArrayList;
-+import java.util.List;
 +import org.bukkit.Location;
-+
 +import org.bukkit.craftbukkit.entity.CraftHumanEntity;
 +import org.bukkit.entity.HumanEntity;
 +// CraftBukkit end
@@ -16,7 +14,7 @@
  public class PlayerInventory implements IInventory, INamableTileEntity {
  
      public final NonNullList<ItemStack> items;
-@@ -16,6 +25,54 @@
+@@ -16,6 +23,54 @@
      private ItemStack carried;
      private int h;
  
@@ -71,7 +69,7 @@
      public PlayerInventory(EntityHuman entityhuman) {
          this.items = NonNullList.a(36, ItemStack.a);
          this.armor = NonNullList.a(4, ItemStack.a);
-@@ -41,6 +98,22 @@
+@@ -41,6 +96,22 @@
          return itemstack.getItem() == itemstack1.getItem() && ItemStack.equals(itemstack, itemstack1);
      }
  
@@ -94,7 +92,7 @@
      public int getFirstEmptySlotIndex() {
          for (int i = 0; i < this.items.size(); ++i) {
              if (((ItemStack) this.items.get(i)).isEmpty()) {
-@@ -513,8 +586,9 @@
+@@ -513,8 +584,9 @@
                  ItemStack itemstack = (ItemStack) this.armor.get(i);
  
                  if (itemstack.getItem() instanceof ItemArmor) {
@@ -105,7 +103,7 @@
                      });
                  }
              }
-@@ -550,6 +624,11 @@
+@@ -550,6 +622,11 @@
      }
  
      public ItemStack getCarried() {