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/0599-Sanitize-ResourceLocation-error-logging.patch

@@ -0,0 +1,28 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Nassim Jahnke <nassim@njahnke.dev>
+Date: Thu, 26 Aug 2021 12:09:47 +0200
+Subject: [PATCH] Sanitize ResourceLocation error logging
+
+
+diff --git a/src/main/java/net/minecraft/resources/ResourceLocation.java b/src/main/java/net/minecraft/resources/ResourceLocation.java
+index 262660d115a5d5cbecfbae995955a24283e666b0..87afe84791af2d5e9f869cd4c09eed4bb5fee75b 100644
+--- a/src/main/java/net/minecraft/resources/ResourceLocation.java
++++ b/src/main/java/net/minecraft/resources/ResourceLocation.java
+@@ -247,7 +247,7 @@ public final class ResourceLocation implements Comparable<ResourceLocation> {
+ 
+     private static String assertValidNamespace(String namespace, String path) {
+         if (!isValidNamespace(namespace)) {
+-            throw new ResourceLocationException("Non [a-z0-9_.-] character in namespace of location: " + namespace + ":" + path);
++            throw new ResourceLocationException("Non [a-z0-9_.-] character in namespace of location: " + org.apache.commons.lang3.StringUtils.normalizeSpace(namespace) + ":" + org.apache.commons.lang3.StringUtils.normalizeSpace(path)); // Paper - Sanitize ResourceLocation error logging
+         } else {
+             return namespace;
+         }
+@@ -268,7 +268,7 @@ public final class ResourceLocation implements Comparable<ResourceLocation> {
+ 
+     private static String assertValidPath(String namespace, String path) {
+         if (!isValidPath(path)) {
+-            throw new ResourceLocationException("Non [a-z0-9/._-] character in path of location: " + namespace + ":" + path);
++            throw new ResourceLocationException("Non [a-z0-9/._-] character in path of location: " + namespace + ":" + org.apache.commons.lang3.StringUtils.normalizeSpace(path)); // Paper - Sanitize ResourceLocation error logging
+         } else {
+             return path;
+         }