fixed bugs, memory leaks, etc

src/main/java/dev/zprestige/prestige/math/LegacyParticlePhysics.java

@@ -8,7 +8,7 @@ import net.minecraft.util.math.Vec3d;
 public class LegacyParticlePhysics extends HitParticlePhysics {
     @Override
     public void updateMotion(HitParticle particle, boolean physicsEnabled) {
-        if (!physicsEnabled) {
+        if (!physicsEnabled || MinecraftAccess.mc.world == null) {
             this.applyLegacyMotion(particle);
         } else {
             if (!this.isPassable(MinecraftAccess.mc.world.getBlockState(BlockPos.ofFloored(particle.pos.x, particle.pos.y, particle.pos.z + particle.velocity.z)))) {