Make anti-xray chunk edge mode LOAD the default

Fixes GH-1749

Setting the new default to load chunk edge neighbors may have unintended
side-effects so feedback will be important. Specifically, if you're not
using the asynchronous chunk loader, you should probably switch to mode
2 (WAIT)

Old users will be migrated automatically if: You're using engine mode 1
(HIDE) and you're using chunk-edge-mode 1 (DEFAULT). Other users will
not be migrated.

Thanks @stonar96

Spigot-Server-Patches/Add-option-to-prevent-players-from-moving-into-unloa.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Add option to prevent players from moving into unloaded
 
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 48920b045..77368b17a 100644
+index 575281991..f47a648af 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
@@ -20,7 +20,7 @@ index 48920b045..77368b17a 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
-index 8899ad0f6..f78c6e991 100644
+index 0bcb9c1ab..c1f47701c 100644
 --- a/src/main/java/net/minecraft/server/PlayerConnection.java
 +++ b/src/main/java/net/minecraft/server/PlayerConnection.java
 @@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {

Spigot-Server-Patches/Anti-Xray.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Anti-Xray
 
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 6feea98b6..2220a18d9 100644
+index 6feea98b6..2a0aa2d6d 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@
@@ -37,8 +37,15 @@ index 6feea98b6..2220a18d9 100644
 +        asynchronous = true;
 +        engineMode = EngineMode.getById(getInt("anti-xray.engine-mode", EngineMode.HIDE.getId()));
 +        engineMode = engineMode == null ? EngineMode.HIDE : engineMode;
-+        chunkEdgeMode = ChunkEdgeMode.getById(getInt("anti-xray.chunk-edge-mode", ChunkEdgeMode.DEFAULT.getId()));
++        chunkEdgeMode = ChunkEdgeMode.getById(getInt("anti-xray.chunk-edge-mode", ChunkEdgeMode.LOAD.getId()));
 +        chunkEdgeMode = chunkEdgeMode == null ? ChunkEdgeMode.DEFAULT : chunkEdgeMode;
++
++        if (PaperConfig.version < 17 && engineMode == EngineMode.HIDE && chunkEdgeMode == ChunkEdgeMode.DEFAULT) {
++            set("anti-xray.chunk-edge-mode", ChunkEdgeMode.LOAD.getId());
++            chunkEdgeMode = ChunkEdgeMode.LOAD;
++            log("Migrating Anti-Xray engine mode to mode 3 (LOAD)");
++        }
++
 +        maxChunkSectionIndex = getInt("anti-xray.max-chunk-section-index", 3);
 +        maxChunkSectionIndex = maxChunkSectionIndex > 15 ? 15 : maxChunkSectionIndex;
 +        updateRadius = getInt("anti-xray.update-radius", 2);
@@ -1071,7 +1078,7 @@ index edf4d9130..71d865b76 100644
                  this.initLighting();
              }
 diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
-index 829cc9ed8..18c06d3c8 100644
+index 60143ff63..d938eb374 100644
 --- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
 +++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
 @@ -0,0 +0,0 @@ public class ChunkRegionLoader implements IChunkLoader, IAsyncChunkSaver {
@@ -1452,7 +1459,7 @@ index 7d3f846a1..240f59066 100644
                  } else {
                      this.a((Packet) (new PacketPlayOutMultiBlockChange(this.dirtyCount, this.dirtyBlocks, this.chunk)));
 diff --git a/src/main/java/net/minecraft/server/PlayerInteractManager.java b/src/main/java/net/minecraft/server/PlayerInteractManager.java
-index c884fcd34..1d76c4c99 100644
+index ef0b03795..cf5392311 100644
 --- a/src/main/java/net/minecraft/server/PlayerInteractManager.java
 +++ b/src/main/java/net/minecraft/server/PlayerInteractManager.java
 @@ -0,0 +0,0 @@ public class PlayerInteractManager {

Spigot-Server-Patches/Optimize-redstone-algorithm.patch

@@ -19,7 +19,7 @@ Aside from making the obvious class/function renames and obfhelpers I didn't nee
 Just added Bukkit's event system and took a few liberties with dead code and comment misspellings.
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 77368b17a..5981a5f51 100644
+index f47a648af..eefbb355d 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {

Spigot-Server-Patches/Paper-config-files.patch

@@ -249,7 +249,7 @@ index 000000000..961966e16
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
 new file mode 100644
-index 000000000..f0473d9bf
+index 000000000..5586575ce
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
 @@ -0,0 +0,0 @@
@@ -314,8 +314,8 @@ index 000000000..f0473d9bf
 +        commands = new HashMap<String, Command>();
 +        commands.put("paper", new PaperCommand("paper"));
 +
-+        version = getInt("config-version", 16);
-+        set("config-version", 16);
++        version = getInt("config-version", 17);
++        set("config-version", 17);
 +        readConfig(PaperConfig.class, null);
 +    }
 +
@@ -511,7 +511,7 @@ index 000000000..a73865739
 +    }
 +}
 diff --git a/src/main/java/net/minecraft/server/DedicatedServer.java b/src/main/java/net/minecraft/server/DedicatedServer.java
-index 229c25338..197d116c6 100644
+index 64a6a681f..ad9c00bc8 100644
 --- a/src/main/java/net/minecraft/server/DedicatedServer.java
 +++ b/src/main/java/net/minecraft/server/DedicatedServer.java
 @@ -0,0 +0,0 @@ public class DedicatedServer extends MinecraftServer implements IMinecraftServer
@@ -531,7 +531,7 @@ index 229c25338..197d116c6 100644
              DedicatedServer.LOGGER.info("Generating keypair");
              this.a(MinecraftEncryption.b());
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
-index 5289325a2..b1a4a6d70 100644
+index 9ebafa6b9..0fac63db0 100644
 --- a/src/main/java/net/minecraft/server/Entity.java
 +++ b/src/main/java/net/minecraft/server/Entity.java
 @@ -0,0 +0,0 @@ public abstract class Entity implements INamableTileEntity, ICommandListener {
@@ -593,7 +593,7 @@ index 6ea9eaa1a..5531f5205 100644
          this.world = new CraftWorld((WorldServer) this, gen, env);
          this.ticksPerAnimalSpawns = this.getServer().getTicksPerAnimalSpawns(); // CraftBukkit
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index aa0dfa4cc..a3c07fbac 100644
+index fc49882c2..f31b18dd2 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -0,0 +0,0 @@ public final class CraftServer implements Server {