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:
bb813f6f SPIGOT-4605: Warn against hacking physics

CraftBukkit Changes:
2ced0233 Don't handle sync packets for kicked players
d5e96882 SPIGOT-4602: Cache reflection in decompile error workaround

Spigot Changes:
b0f4c22b SPIGOT-4605: Catch more physics problems

Spigot-Server-Patches/Add-velocity-warnings.patch

@@ -66,12 +66,12 @@ index 9a5bb0222..a82717f5c 100644
      public double getHeight() {
          return getHandle().length;
 diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
-index 21316d67f..5d03191c8 100644
+index 8e32c4e2c..c080a6118 100644
 --- a/src/main/java/org/spigotmc/WatchdogThread.java
 +++ b/src/main/java/org/spigotmc/WatchdogThread.java
 @@ -0,0 +0,0 @@ public class WatchdogThread extends Thread
                      log.log( Level.SEVERE, "During the run of the server, a physics stackoverflow was supressed" );
-                     log.log( Level.SEVERE, "near " + net.minecraft.server.World.blockLocation);
+                     log.log( Level.SEVERE, "near " + net.minecraft.server.World.lastPhysicsProblem );
                  }
 -                //
 +                // Paper start - Warn in watchdog if an excessive velocity was ever set