Remove wall-time / unused skip tick protection (#11412)

Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.

patches/server/0716-Add-Player-getFishHook.patch

@@ -0,0 +1,26 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: u9g <git@u9g.dev>
+Date: Tue, 14 Jun 2022 19:36:10 -0400
+Subject: [PATCH] Add Player#getFishHook
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
+index 0222b6c68112551336f17a722fc3399898cdc7bb..049db909fbd8610ebb688d948f5d03c97ab23495 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
+@@ -160,6 +160,15 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
+         return new Location(worldServer.getWorld(), bed.getX(), bed.getY(), bed.getZ());
+     }
+     // Paper end
++    // Paper start
++    @Override
++    public org.bukkit.entity.FishHook getFishHook() {
++        if (getHandle().fishing == null) {
++            return null;
++        }
++        return (org.bukkit.entity.FishHook) getHandle().fishing.getBukkitEntity();
++    }
++    // Paper end
+     @Override
+     public boolean sleep(Location location, boolean force) {
+         Preconditions.checkArgument(location != null, "Location cannot be null");