Optimize Network Manager to not need synchronization

Removes synchronization from sending packets
Makes normal packet sends no longer need to be wrapped and queued like it use to work.
Adds more packet queue immunities on top of keep alive to let the following scenarios go out
without delay:
  - Keep Alive
  - Chat
  - Kick
  - All of the packets during the Player Joined World event

Hoping that latter one helps join timeout issues more too for slow connections.

Removes processing packet queue off of main thread
  - for the few cases where it is allowed, order is not necessary nor
    should it even be happening concurrently in first place (handshaking/login/status)

Ensures packets sent asynchronously are dispatched on main thread

This helps ensure safety for ProtocolLib as packet listeners
are commonly accessing world state. This will allow you to schedule
a packet to be sent async, but itll be dispatched sync for packet
listeners to process.

This should solve some deadlock risks

This may provide a decent performance improvement because thread synchronization incurs a cache reset
so by avoiding ever entering a synchronized block, we get to avoid that, and packet sending is a really
hot activity.

Spigot-Server-Patches/Make-the-GUI-graph-fancier.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Make the GUI graph fancier
 
 diff --git a/src/main/java/com/destroystokyo/paper/gui/GraphColor.java b/src/main/java/com/destroystokyo/paper/gui/GraphColor.java
 new file mode 100644
-index 0000000000..a4e641fdcc
+index 00000000000..a4e641fdccc
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/gui/GraphColor.java
 @@ -0,0 +0,0 @@
@@ -56,7 +56,7 @@ index 0000000000..a4e641fdcc
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/gui/GraphData.java b/src/main/java/com/destroystokyo/paper/gui/GraphData.java
 new file mode 100644
-index 0000000000..186fc72296
+index 00000000000..186fc722965
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/gui/GraphData.java
 @@ -0,0 +0,0 @@
@@ -109,7 +109,7 @@ index 0000000000..186fc72296
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/gui/GuiStatsComponent.java b/src/main/java/com/destroystokyo/paper/gui/GuiStatsComponent.java
 new file mode 100644
-index 0000000000..0f29ad583e
+index 00000000000..0f29ad583e7
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/gui/GuiStatsComponent.java
 @@ -0,0 +0,0 @@
@@ -156,7 +156,7 @@ index 0000000000..0f29ad583e
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/gui/RAMDetails.java b/src/main/java/com/destroystokyo/paper/gui/RAMDetails.java
 new file mode 100644
-index 0000000000..e463a86a6a
+index 00000000000..e463a86a6ad
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/gui/RAMDetails.java
 @@ -0,0 +0,0 @@
@@ -236,7 +236,7 @@ index 0000000000..e463a86a6a
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/gui/RAMGraph.java b/src/main/java/com/destroystokyo/paper/gui/RAMGraph.java
 new file mode 100644
-index 0000000000..c3e54da4ab
+index 00000000000..c3e54da4ab6
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/gui/RAMGraph.java
 @@ -0,0 +0,0 @@
@@ -385,7 +385,7 @@ index 0000000000..c3e54da4ab
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/GuiStatsComponent.java b/src/main/java/net/minecraft/server/GuiStatsComponent.java
-index c21db8e6b7..7b6e935257 100644
+index c21db8e6b79..7b6e9352578 100644
 --- a/src/main/java/net/minecraft/server/GuiStatsComponent.java
 +++ b/src/main/java/net/minecraft/server/GuiStatsComponent.java
 @@ -0,0 +0,0 @@ import javax.swing.Timer;
@@ -398,7 +398,7 @@ index c21db8e6b7..7b6e935257 100644
      });
      private final int[] b = new int[256];
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index 63db74993c..d1f82eff21 100644
+index 63db74993c1..d1f82eff218 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 extends IAsyncTaskHandlerReentrant<TickTas
@@ -411,7 +411,7 @@ index 63db74993c..d1f82eff21 100644
      private KeyPair I;
      @Nullable
 diff --git a/src/main/java/net/minecraft/server/ServerGUI.java b/src/main/java/net/minecraft/server/ServerGUI.java
-index 95561d9db4..470009fe4c 100644
+index 95561d9db4b..470009fe4c4 100644
 --- a/src/main/java/net/minecraft/server/ServerGUI.java
 +++ b/src/main/java/net/minecraft/server/ServerGUI.java
 @@ -0,0 +0,0 @@ public class ServerGUI extends JComponent {