#762: Add TNTPrimed#setSource method

By: Jakub Zacek <dawon.cz@gmail.com>

paper-server/nms-patches/EntityTNTPrimed.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/server/EntityTNTPrimed.java
 +++ b/net/minecraft/server/EntityTNTPrimed.java
-@@ -1,6 +1,7 @@
+@@ -1,13 +1,16 @@
  package net.minecraft.server;
  
  import javax.annotation.Nullable;
@@ -8,9 +8,10 @@
  
  public class EntityTNTPrimed extends Entity {
  
-@@ -8,6 +9,8 @@
+     private static final DataWatcherObject<Integer> FUSE_TICKS = DataWatcher.a(EntityTNTPrimed.class, DataWatcherRegistry.b);
      @Nullable
-     private EntityLiving source;
+-    private EntityLiving source;
++    public EntityLiving source; // PAIL private -> public
      private int fuseTicks;
 +    public float yield = 4; // CraftBukkit - add field
 +    public boolean isIncendiary = false; // CraftBukkit - add field