Add server oversleep to timings (#2509)

Now everything except waiting for the next tick should be included
in timings

Spigot-Server-Patches/Server-Tick-Events.patch

@@ -6,11 +6,11 @@ Subject: [PATCH] Server Tick Events
 Fires event at start and end of a server tick
 
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index aec871dd24..35c5d38c21 100644
+index a7b63ab421..24dccfb7a1 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
-         co.aikar.timings.TimingsManager.FULL_SERVER_TICK.startTiming(); // Paper
+         // Paper end
          this.slackActivityAccountant.tickStarted(); // Spigot
          long i = SystemUtils.getMonotonicNanos();
 +        new com.destroystokyo.paper.event.server.ServerTickStartEvent(this.ticks+1).callEvent(); // Paper