Updated Upstream (Bukkit/CraftBukkit/Spigot)

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

Bukkit Changes:
64c8bd39 #679: Add getHideOnlinePlayers
b991b6c7 #677: Add "Allow Server Listings" API
4e9f199a SPIGOT-6801: Wrong BlockData classes in Material enum for SOUL_FIRE and SOUL_TORCH

CraftBukkit Changes:
37e63e63 Fix loading / creating secondary worlds (nether/end)
4bf7f33c #956: Add getHideOnlinePlayers
d181e1ed Fix serializing unhandled NBT + add unit test with unhandled NBT
aebb79e3 #954: Add "Allow Server Listings" API
7c4707e4 #955: Add test for BlockData class of Material

Spigot Changes:
16c0cb41 Rebuild patches

patches/api/Adventure.patch

@@ -1890,7 +1890,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      /**
 @@ -0,0 +0,0 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
       */
-     public void openBook(@NotNull ItemStack book);
+     public boolean isAllowingServerListings();
  
 +    // Paper start
 +    @NotNull