Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
26c37d99d5 create random seeds for features using SecureRandom
589bf2f1bf Upgrade gson to 2.8.8 (Closes #6370)
0a6103597b Get entity default attributes (#6449)
40057019e0 Correctly inflate villager activation bounding box (#6798)
e5f9241d15 Left handed API (#6775)
40ee63496c Add advancement display API (#6175)
9d570042ed Add ItemFactory#getMonsterEgg API (#6772)
55ca459515 rename method to getSpawnEgg
bb397ba74c Add critical damage API (#6275)
f47aeafe00 Add Horse Animation API (#5599)
7a0886180f AT & Mapping fixes (#6809)
5553432644 docs: Update gradle instructions for Java 16 (#6811) [ci skip]
a1f49e4c60 Fix command suggestion leak (#6592)
9472d38f3c Fix method name for Critical damage (#6813)

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 6619d9109089d427e3eaec1f8c18dce23d6b7802..e6b25b745fa46393fd3ce2949c5336673e552320 100644
+--- a/src/main/java/org/bukkit/entity/Player.java
++++ b/src/main/java/org/bukkit/entity/Player.java
+@@ -2322,5 +2322,26 @@ 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
+ }