Begin implementation of CheckStyle style checking

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

paper-server/nms-patches/EntityTrackerEntry.patch

@@ -1,17 +1,17 @@
 --- a/net/minecraft/server/EntityTrackerEntry.java
 +++ b/net/minecraft/server/EntityTrackerEntry.java
-@@ -8,6 +8,11 @@
- import java.util.function.Consumer;
+@@ -9,6 +9,11 @@
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
-+ 
+ 
 +// CraftBukkit start
 +import org.bukkit.entity.Player;
 +import org.bukkit.event.player.PlayerVelocityEvent;
 +// CraftBukkit end
- 
++
  public class EntityTrackerEntry {
  
+     private static final Logger a = LogManager.getLogger();
 @@ -29,8 +34,12 @@
      private List<Entity> p;
      private boolean q;