Updated Upstream (Paper)

Upstream has released updates that appear to apply and compile correctly

Paper Changes:
05cb10c56f Add repo for Velocity natives to dev bundle (#6536)
7bd7b18811 Configurable feature seeds (#6531)
ca708a0944 Updated Upstream (Bukkit/CraftBukkit/Spigot) (#6539)
f02d3d8989 flattener should try to render custom translations (#6540)
1276bd5039 Fixed layers from V2550 not being added to list (#6541)
a763f258da docs: remove Paper tool method for patch mods
20903fcf5e docs: drop table of contents; it's built into GH

patches/server/0116-Arrows-should-not-reset-despawn-counter.patch

@@ -0,0 +1,21 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: William Blake Galbreath <Blake.Galbreath@GMail.com>
+Date: Wed, 4 Nov 2020 13:12:50 -0600
+Subject: [PATCH] Arrows should not reset despawn counter
+
+This prevents keeping arrows alive indefinitely (such as when the block
+the arrow is stuck in gets removed, like a piston head going up/down)
+
+diff --git a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+index f6fc98ffe49d5af9a69f57f2e53e6010f71d55d9..9f35f72a0bacf3847adedbfbd327ab55c483e85c 100644
+--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
++++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+@@ -308,7 +308,7 @@ public abstract class AbstractArrow extends Projectile {
+         Vec3 vec3d = this.getDeltaMovement();
+ 
+         this.setDeltaMovement(vec3d.multiply((double) (this.random.nextFloat() * 0.2F), (double) (this.random.nextFloat() * 0.2F), (double) (this.random.nextFloat() * 0.2F)));
+-        this.life = 0;
++        // this.life = 0; // PUrpur - do not reset despawn counter
+     }
+ 
+     @Override