Updated Upstream (Bukkit/CraftBukkit/Spigot)

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

Bukkit Changes:
c2d72c82 SPIGOT-3102: Add EXPLOSION SpawnReason

CraftBukkit Changes:
fca41573 SPIGOT-5136: EntityPortalEvent getting called on interdimensional entity teleports
604c8bf0 SPIGOT-3102: Add EXPLOSION SpawnReason
375969a6 Re-add chunk GC for plugin chunk loads
58151368 SPIGOT-5123: Snapshot tile entities can end up with a non-null world
491c8482 SPIGOT-5130: PersistentDataContainer not removing values on TileEntities

Spigot Changes:
d05d3c1f Rebuild patches

Spigot-Server-Patches/Fix-Old-Sign-Conversion.patch

@@ -25,11 +25,11 @@ index 7bcd9786a2..775ec63890 100644
                              }
  
 diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
-index e79e256138..5e495a4b8c 100644
+index e1db243165..af6977dcdc 100644
 --- a/src/main/java/net/minecraft/server/TileEntity.java
 +++ b/src/main/java/net/minecraft/server/TileEntity.java
 @@ -0,0 +0,0 @@ public abstract class TileEntity implements KeyedObject { // Paper
-     public final CraftPersistentDataContainer persistentDataContainer = new CraftPersistentDataContainer(DATA_TYPE_REGISTRY);
+     public CraftPersistentDataContainer persistentDataContainer;
      // CraftBukkit end
      private static final Logger LOGGER = LogManager.getLogger();
 +    boolean isLoadingStructure = false; // Paper
@@ -37,7 +37,7 @@ index e79e256138..5e495a4b8c 100644
      @Nullable
      protected World world;
 diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
-index a8f0aae9ea..2c6ce5bae0 100644
+index 914f4e6da2..ddf8f46596 100644
 --- a/src/main/java/net/minecraft/server/TileEntitySign.java
 +++ b/src/main/java/net/minecraft/server/TileEntitySign.java
 @@ -0,0 +0,0 @@ public class TileEntitySign extends TileEntity implements ICommandListener { //