start work

src/main/java/lol/pyr/znpcsplus/npc/NPC.java

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+package lol.pyr.znpcsplus.npc;
+
+public class NPC {
+}

src/main/java/lol/pyr/znpcsplus/npc/NPCType.java

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+package lol.pyr.znpcsplus.npc;
+
+public class NPCType {
+}

src/main/java/lol/pyr/znpcsplus/packets/PacketFactory.java

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+package lol.pyr.znpcsplus.packets;
+
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.manager.server.ServerVersion;
+import lol.pyr.znpcsplus.util.LazyLoader;
+
+import java.util.Map;
+
+public interface PacketFactory {
+
+    Map<ServerVersion, LazyLoader<? extends PacketFactory>> factories = buildFactoryMap();
+
+
+    static PacketFactory get() {
+        return factories.get(PacketEvents.getAPI().getServerManager().getVersion()).get();
+    }
+
+    private static Map<ServerVersion, LazyLoader<? extends PacketFactory>> buildFactoryMap() {
+
+    }
+}

src/main/java/lol/pyr/znpcsplus/packets/V1_8Factory.java

@@ -0,0 +1,4 @@
+package lol.pyr.znpcsplus.packets;
+
+public class V1_8Factory implements PacketFactory {
+}

src/main/java/lol/pyr/znpcsplus/util/LazyLoader.java

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+package lol.pyr.znpcsplus.util;
+
+public class LazyLoader <T> {
+    private final ObjectProvider<T> provider;
+    private T value;
+
+    private LazyLoader(ObjectProvider<T> provider) {
+        this.provider = provider;
+    }
+
+    public T get() {
+        if (value == null) value = provider.provide();
+        return value;
+    }
+
+    public static <T> LazyLoader<T> of(ObjectProvider<T> provider) {
+        return new LazyLoader<>(provider);
+    }
+
+    @FunctionalInterface
+    public interface ObjectProvider<T> {
+        T provide();
+    }
+}