Updated Upstream (Spigot) (#4745)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Spigot Changes:
a19903d2 SPIGOT-520: Add option to disable player data saving

Spigot-Server-Patches/Configurable-Alternative-LootPool-Luck-Formula.patch

@@ -40,8 +40,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
 @@ -0,0 +0,0 @@ public class PaperConfig {
-                     "such as inventories, experience points, advancements and the like will not be saved when they log out.");
-         }
+     private static void authenticationServersDownKickMessage() {
+         authenticationServersDownKickMessage = Strings.emptyToNull(getString("messages.kick.authentication-servers-down", authenticationServersDownKickMessage));
      }
 +
 +    public static boolean useAlternativeLuckFormula = false;