fix: Prevent mobs from targeting players in creative mode

Mobs were incorrectly targeting and attacking players who are in
creative mode (invulnerable).

Minecraft.World/LeapAtTargetGoal.cpp

@@ -2,6 +2,7 @@
 #include "net.minecraft.world.entity.ai.control.h"
 #include "net.minecraft.world.entity.h"
 #include "LeapAtTargetGoal.h"
+#include "Player.h"
 
 LeapAtTargetGoal::LeapAtTargetGoal(Mob *mob, float yd)
 {
@@ -25,7 +26,16 @@ bool LeapAtTargetGoal::canUse()
 
 bool LeapAtTargetGoal::canContinueToUse()
 {
-	return target.lock() != nullptr && !mob->onGround;
+    shared_ptr<LivingEntity> mobTarget = target.lock();
+    if (mobTarget == nullptr) return false;
+    if (!mobTarget->isAlive()) return false;
+    
+    if (mobTarget->instanceof(eTYPE_PLAYER)) {
+        shared_ptr<Player> player = dynamic_pointer_cast<Player>(mobTarget);
+        if (player->abilities.invulnerable) return false;
+    }
+    
+	return !mob->onGround;
 }
 
 void LeapAtTargetGoal::start()

Minecraft.World/PathfinderMob.cpp

@@ -63,6 +63,14 @@ void PathfinderMob::serverAiStep()
 	{
 		if (attackTarget->isAlive())
 		{
+		    if (attackTarget->instanceof(eTYPE_PLAYER)) {
+		        shared_ptr<Player> player = dynamic_pointer_cast<Player>(attackTarget);
+		        if (player->abilities.invulnerable)
+		        {
+		            attackTarget = nullptr;
+		            return;
+		        }
+		    }
 			float d = attackTarget->distanceTo(shared_from_this());
 			if (canSee(attackTarget))
 			{

Minecraft.World/TargetGoal.cpp

@@ -37,6 +37,11 @@ bool TargetGoal::canContinueToUse()
 	if (target == nullptr) return false;
 	if (!target->isAlive()) return false;
 
+	if (target->instanceof(eTYPE_PLAYER)) {
+		shared_ptr<Player> player = dynamic_pointer_cast<Player>(target);
+		if (player->abilities.invulnerable) return false;
+	}
+
 	double within = getFollowDistance();
 	if (mob->distanceToSqr(target) > within * within) return false;
 	if (mustSee)