[SPIGOT-946] Begin making use of access transforms to simplify patching.

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

paper-server/nms-patches/EntityArrow.patch

@@ -13,15 +13,6 @@
  public class EntityArrow extends Entity implements IProjectile {
  
      private int d = -1;
-@@ -16,7 +22,7 @@
-     private int ar;
-     private int as;
-     private double damage = 2.0D;
--    private int knockbackStrength;
-+    public int knockbackStrength; // CraftBukkit - public
- 
-     public EntityArrow(World world) {
-         super(world);
 @@ -35,6 +41,7 @@
          super(world);
          this.j = 10.0D;