add back pufferfish patches

patches/api/0016-Player-invulnerabilities.patch

@@ -0,0 +1,37 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <Blake.Galbreath@GMail.com>
+Date: Sat, 2 May 2020 20:55:31 -0500
+Subject: [PATCH] Player invulnerabilities
+
+
+diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
+index 169a523eb11b899bd4a227c788750e4b226163c6..da270c17ce413e6a75e1007b93dd013be38f0148 100644
+--- a/src/main/java/org/bukkit/entity/Player.java
++++ b/src/main/java/org/bukkit/entity/Player.java
+@@ -3114,5 +3114,26 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
+      * Reset the idle timer back to 0
+      */
+     void resetIdleTimer();
++
++    /**
++     * Check if player is invulnerable from recently spawning or accepting a resource pack
++     *
++     * @return True if invulnerable
++     */
++    boolean isSpawnInvulnerable();
++
++    /**
++     * Get invulnerable ticks remaining
++     *
++     * @return Invulnerable ticks
++     */
++    int getSpawnInvulnerableTicks();
++
++    /**
++     * Set invulnerable ticks remaining
++     *
++     * @param invulnerableTicks Invulnerable ticks remaining
++     */
++    void setSpawnInvulnerableTicks(int invulnerableTicks);
+     // Purpur end
+ }