Add Velocity IP forwarding support (#1557)

While Velocity supports BungeeCord-style IP forwarding, it is not secure. Users
have a lot of problems setting up firewalls or setting up plugins like IPWhitelist.
Further, the BungeeCord IP forwarding protocol still retains essentially its original
form, when there is brand new support for custom login plugin messages in 1.13.

Velocity's modern IP forwarding uses an HMAC-SHA256 code to ensure authenticity
of messages, is packed into a binary format that is smaller than BungeeCord's
forwarding, and is integrated into the Minecraft login process by using the 1.13
login plugin message packet.

Spigot-Server-Patches/Lighting-Queue.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Lighting Queue
 This provides option to queue lighting updates to ensure they do not cause the server lag
 
 diff --git a/src/main/java/co/aikar/timings/WorldTimingsHandler.java b/src/main/java/co/aikar/timings/WorldTimingsHandler.java
-index 145cb274b0..eff9dcf54f 100644
+index 145cb274b..eff9dcf54 100644
 --- a/src/main/java/co/aikar/timings/WorldTimingsHandler.java
 +++ b/src/main/java/co/aikar/timings/WorldTimingsHandler.java
 @@ -0,0 +0,0 @@ public class WorldTimingsHandler {
@@ -28,7 +28,7 @@ index 145cb274b0..eff9dcf54f 100644
  
      public static Timing getTickList(WorldServer worldserver, String timingsType) {
 diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
-index 8be079e26e..0968852922 100644
+index 2f17e5219..aa920c469 100644
 --- 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 {
@@ -46,7 +46,7 @@ index 8be079e26e..0968852922 100644
          boolean timings = getBoolean("timings.enabled", true);
          boolean verboseTimings = getBoolean("timings.verbose", true);
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 39d565db1f..8f6f0288be 100644
+index 39d565db1..8f6f0288b 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
@@ -63,7 +63,7 @@ index 39d565db1f..8f6f0288be 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index af181d4bd7..6fa379e580 100644
+index af181d4bd..6fa379e58 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@ public class Chunk implements IChunkAccess {
@@ -126,7 +126,7 @@ index af181d4bd7..6fa379e580 100644
  
          IMMEDIATE, QUEUED, CHECK;
 diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
-index 31ed3e43a5..0b03c6266a 100644
+index 31ed3e43a..0b03c6266 100644
 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
 +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
 @@ -0,0 +0,0 @@ public class ChunkProviderServer implements IChunkProvider {
@@ -138,7 +138,7 @@ index 31ed3e43a5..0b03c6266a 100644
          // Update neighbor counts
          for (int x = -2; x < 3; x++) {
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index d6ea4ae532..5086fe4027 100644
+index d6ea4ae53..5086fe402 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
 @@ -0,0 +0,0 @@ public abstract class MinecraftServer implements IAsyncTaskHandler, IMojangStati
@@ -160,7 +160,7 @@ index d6ea4ae532..5086fe4027 100644
      }
 diff --git a/src/main/java/net/minecraft/server/PaperLightingQueue.java b/src/main/java/net/minecraft/server/PaperLightingQueue.java
 new file mode 100644
-index 0000000000..5fabc5b55c
+index 000000000..5fabc5b55
 --- /dev/null
 +++ b/src/main/java/net/minecraft/server/PaperLightingQueue.java
 @@ -0,0 +0,0 @@
@@ -263,7 +263,7 @@ index 0000000000..5fabc5b55c
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index 499d64ea2c..e06da6bef9 100644
+index 499d64ea2..e06da6bef 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
 @@ -0,0 +0,0 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc