Add chunk unload delay config option

The default config option is no unload delay, so that
it maintains parity with Vanilla.

Fixes https://github.com/Tuinity/Moonrise/issues/115

src/main/java/ca/spottedleaf/moonrise/common/config/moonrise/MoonriseConfig.java

@@ -2,6 +2,7 @@ package ca.spottedleaf.moonrise.common.config.moonrise;
 
 import ca.spottedleaf.moonrise.common.config.ui.ClothConfig;
 import ca.spottedleaf.moonrise.common.util.MoonriseCommon;
+import ca.spottedleaf.moonrise.patches.chunk_system.player.RegionizedPlayerChunkLoader;
 import ca.spottedleaf.moonrise.patches.chunk_system.scheduling.ChunkTaskScheduler;
 import ca.spottedleaf.yamlconfig.InitialiseHook;
 import ca.spottedleaf.yamlconfig.annotation.Adaptable;
@@ -38,7 +39,7 @@ public final class MoonriseConfig {
 
 
         @Adaptable
-        public static final class Basic {
+        public static final class Basic implements InitialiseHook {
             @Serializable(
                     comment = """
                             The maximum rate of chunks to send to any given player, per second. If this value is <= 0,
@@ -72,6 +73,20 @@ public final class MoonriseConfig {
                     section = CHUNK_SYSTEM_SECTION
             )
             public double playerMaxGenRate = -1.0;
+
+            @Serializable(
+                comment = """
+                            The delay before chunks are unloaded around players once they leave their view distance.
+                            The Vanilla value is 0 ticks. Setting this value higher (i.e 5s) will allow pets to teleport
+                            to their owners when they teleport.
+                            """
+            )
+            public Duration playerChunkUnloadDelay = Duration.parse("0t");
+
+            @Override
+            public void initialise() {
+                RegionizedPlayerChunkLoader.setUnloadDelay(this.playerChunkUnloadDelay.getTimeTicks());
+            }
         }
 
         @Serializable(

src/main/java/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java

@@ -46,7 +46,7 @@ import java.util.function.Function;
 public final class RegionizedPlayerChunkLoader {
 
     public static final TicketType<Long> PLAYER_TICKET         = TicketType.create("chunk_system:player_ticket", Long::compareTo);
-    public static final TicketType<Long> PLAYER_TICKET_DELAYED = TicketType.create("chunk_system:player_ticket_delayed", Long::compareTo, 5 * 20);
+    public static final TicketType<Long> PLAYER_TICKET_DELAYED = TicketType.create("chunk_system:player_ticket_delayed", Long::compareTo, 1);
 
     public static final int MIN_VIEW_DISTANCE = 2;
     public static final int MAX_VIEW_DISTANCE = 32;
@@ -55,6 +55,10 @@ public final class RegionizedPlayerChunkLoader {
     public static final int LOADED_TICKET_LEVEL = ChunkTaskScheduler.getTicketLevel(ChunkStatus.EMPTY);
     public static final int TICK_TICKET_LEVEL = ChunkHolderManager.ENTITY_TICKING_TICKET_LEVEL;
 
+    public static void setUnloadDelay(final long ticks) {
+        PLAYER_TICKET_DELAYED.timeout = Math.max(1, ticks);
+    }
+
     public static final class ViewDistanceHolder {
 
         private volatile ViewDistances viewDistances;

src/main/resources/moonrise.accesswidener

@@ -220,6 +220,7 @@ accessible class net/minecraft/server/level/DistanceManager$FixedPlayerDistanceC
 # Ticket
 accessible field net/minecraft/server/level/Ticket key Ljava/lang/Object;
 accessible field net/minecraft/server/level/TicketType timeout J
+mutable field net/minecraft/server/level/TicketType timeout J
 
 
 # ServerChunkCache