feat: add Old Explosion Damage Calculator support(#25)

Co-authored by: MC_XiaoHei <xor7xiaohei@gmail.com>
As a part of : Leaves (https://github.com/LeavesMC/Leaves/blob/3e96b237749a960f297f211d439ffc9ea7fd2381/leaves-server/minecraft-patches/features/0134-Old-wet-tnt-explode-behavior.patch)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)

lophine-server/minecraft-patches/features/0012-Old-Explosion-Damage-Calculator.patch

@@ -0,0 +1,21 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Helvetica Volubi <suisuroru@blue-millennium.fun>
+Date: Mon, 7 Jul 2025 15:33:57 +0800
+Subject: [PATCH] Old Explosion Damage Calculator
+
+Co-authored by: MC_XiaoHei <xor7xiaohei@gmail.com>
+As a part of : Leaves (https://github.com/LeavesMC/Leaves/blob/3e96b237749a960f297f211d439ffc9ea7fd2381/leaves-server/minecraft-patches/features/0134-Old-wet-tnt-explode-behavior.patch)
+Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
+
+diff --git a/net/minecraft/world/level/ServerExplosion.java b/net/minecraft/world/level/ServerExplosion.java
+index b3e897a4afee742b5055d652ad7047a660d8ea04..cf8869fac003c73024634078b2f7b36cddda640e 100644
+--- a/net/minecraft/world/level/ServerExplosion.java
++++ b/net/minecraft/world/level/ServerExplosion.java
+@@ -729,6 +729,7 @@ public class ServerExplosion implements Explosion {
+     public boolean shouldAffectBlocklikeEntities() {
+         boolean _boolean = this.level.getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING);
+         boolean flag = this.source == null || this.source.getType() != EntityType.BREEZE_WIND_CHARGE && this.source.getType() != EntityType.WIND_CHARGE;
++        if (fun.bm.lophine.config.modules.misc.OldFeatureConfig.oldExplosionDamageCalculator) flag = flag && (this.source == null || !this.source.isInWater()); // Leaves - Old MC TNT wet explosion no item damage
+         return _boolean ? flag : this.blockInteraction.shouldAffectBlocklikeEntities() && flag;
+     }
+ 

lophine-server/src/main/java/fun/bm/lophine/config/modules/misc/OldFeatureConfig.java

@@ -14,6 +14,9 @@ public class OldFeatureConfig implements IConfigModule {
     @ConfigInfo(baseName = "old_replaceable_by_mushrooms")
     public static boolean oldReplaceableByMushrooms = false;
 
+    @ConfigInfo(baseName = "old_explosion_damage_calculator")
+    public static boolean oldExplosionDamageCalculator = false;
+
     @Override
     public EnumConfigCategory getCategory() {
         return EnumConfigCategory.MISC;