Improve mid tick chunk loading, Fix Oversleep, other improvements

Process loads outside of any canSleep check. Original intent was to
only apply those restrictions to generations but realized I had some
checks higher up the call chain.

Reworked the back off strategy to just run every 1 millisecond per world,
and to apply the per tick limit to generations only.

This guarantees that your chunk will load with at most around 1ms delay.

Additionally, fire midTick processing in a few more places, notably the
oversleep section so we can keep processing loads here too which has
a large up to 50ms window...

Speaking of oversleep, we had a bug in our implementation changes for
Timings that caused oversleep to not sleep the correct amount.

Because we now moved it into the NEXT tick instead of THIS tick, the
value of nextTick had already been increased to +50ms, resulting in
the risk of sleeping more than it should, but, more importantly, this
caused every task that was trying to NOT run during oversleep to actually
run during oversleep.

This is now fixed.

Another small tweak is to the /tps command, to no longer show the star when
TPS is right at 20.

Due to ineffeciencies in the sleep precision, TPS is commonly 20.02.
This causes the star to show up almost constantly, so now only show it if
we actually hit a real "catchup".

This commit also improves the changes to the CallbackExecutor, in that
it now is also recursion safe.

It was possible that the executor could run tasks out of desired order
if the executor task scheduled more executor tasks.

We solve this by ensuring new additions do not enter the currently iterated queue.

Each depth level will have its own queue.

Fixes #3220

Spigot-Server-Patches/0155-Basic-PlayerProfile-API.patch

@@ -1,4 +1,4 @@
-From 210d72e066a073c2bcce64032a1a0037641c369d Mon Sep 17 00:00:00 2001
+From 8a6737ec1d8a570f928e92e023d0edb85c27cc0a Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Mon, 15 Jan 2018 22:11:48 -0500
 Subject: [PATCH] Basic PlayerProfile API
@@ -7,7 +7,7 @@ Establishes base extension of profile systems for future edits too
 
 diff --git a/src/main/java/com/destroystokyo/paper/profile/CraftPlayerProfile.java b/src/main/java/com/destroystokyo/paper/profile/CraftPlayerProfile.java
 new file mode 100644
-index 00000000..b151a13c
+index 0000000000..b151a13c1b
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/profile/CraftPlayerProfile.java
 @@ -0,0 +1,280 @@
@@ -293,7 +293,7 @@ index 00000000..b151a13c
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/profile/PaperAuthenticationService.java b/src/main/java/com/destroystokyo/paper/profile/PaperAuthenticationService.java
 new file mode 100644
-index 00000000..25836b97
+index 0000000000..25836b975b
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/profile/PaperAuthenticationService.java
 @@ -0,0 +1,30 @@
@@ -329,7 +329,7 @@ index 00000000..25836b97
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/profile/PaperGameProfileRepository.java b/src/main/java/com/destroystokyo/paper/profile/PaperGameProfileRepository.java
 new file mode 100644
-index 00000000..3bcdb8f9
+index 0000000000..3bcdb8f93f
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/profile/PaperGameProfileRepository.java
 @@ -0,0 +1,17 @@
@@ -352,7 +352,7 @@ index 00000000..3bcdb8f9
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/profile/PaperMinecraftSessionService.java b/src/main/java/com/destroystokyo/paper/profile/PaperMinecraftSessionService.java
 new file mode 100644
-index 00000000..4b2a6742
+index 0000000000..4b2a67423f
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/profile/PaperMinecraftSessionService.java
 @@ -0,0 +1,29 @@
@@ -387,7 +387,7 @@ index 00000000..4b2a6742
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/profile/PaperUserAuthentication.java b/src/main/java/com/destroystokyo/paper/profile/PaperUserAuthentication.java
 new file mode 100644
-index 00000000..3aceb0ea
+index 0000000000..3aceb0ea8a
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/profile/PaperUserAuthentication.java
 @@ -0,0 +1,11 @@
@@ -403,7 +403,7 @@ index 00000000..3aceb0ea
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
-index 48f88eab..9d0b0c9f 100644
+index 48f88eaba4..9d0b0c9fc3 100644
 --- a/src/main/java/net/minecraft/server/MCUtil.java
 +++ b/src/main/java/net/minecraft/server/MCUtil.java
 @@ -1,7 +1,10 @@
@@ -429,10 +429,10 @@ index 48f88eab..9d0b0c9f 100644
       * Calculates distance between 2 entities
       * @param e1
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index 94f9201f..ae939c9b 100644
+index 284793e4bf..1f27939670 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
-@@ -1299,7 +1299,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
+@@ -1301,7 +1301,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
              DispenserRegistry.init();
              DispenserRegistry.c();
              File s = (File) optionset.valueOf("universe"); // CraftBukkit
@@ -441,7 +441,7 @@ index 94f9201f..ae939c9b 100644
              MinecraftSessionService minecraftsessionservice = yggdrasilauthenticationservice.createMinecraftSessionService();
              GameProfileRepository gameprofilerepository = yggdrasilauthenticationservice.createProfileRepository();
              UserCache usercache = new UserCache(gameprofilerepository, new File(s, MinecraftServer.b.getName()));
-@@ -1764,6 +1764,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
+@@ -1766,6 +1766,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
          this.H = i;
      }
  
@@ -450,7 +450,7 @@ index 94f9201f..ae939c9b 100644
          return this.minecraftSessionService;
      }
 diff --git a/src/main/java/net/minecraft/server/UserCache.java b/src/main/java/net/minecraft/server/UserCache.java
-index 581199e6..a072222b 100644
+index 581199e6dc..a072222bc5 100644
 --- a/src/main/java/net/minecraft/server/UserCache.java
 +++ b/src/main/java/net/minecraft/server/UserCache.java
 @@ -43,7 +43,7 @@ public class UserCache {
@@ -486,7 +486,7 @@ index 581199e6..a072222b 100644
  
          private UserCacheEntry(GameProfile gameprofile, Date date) {
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index 1f1af567..8d23eb0e 100644
+index 1f1af567b4..8d23eb0e7b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -199,6 +199,9 @@ import org.yaml.snakeyaml.error.MarkedYAMLException;
@@ -525,5 +525,5 @@ index 1f1af567..8d23eb0e 100644
      // Paper end
  }
 -- 
-2.25.1.windows.1
+2.26.2