add movement and packet handlers

src/main/java/lol/vera/spigot/VeraSpigotAPI.java

@@ -1,9 +1,9 @@
 package lol.vera.spigot;
 
 import lol.vera.spigot.implementation.KnockbackImplementation;
+import lol.vera.spigot.implementation.SpigotImplementation;
 import lombok.Data;
 
-
 @Data
 public class VeraSpigotAPI {
 
@@ -11,4 +11,8 @@ public class VeraSpigotAPI {
 
     private KnockbackImplementation knockback
             = new KnockbackImplementation.DEFAULT();
+
+    private SpigotImplementation spigot
+            = new SpigotImplementation.DEFAULT();
+
 }

src/main/java/lol/vera/spigot/implementation/SpigotImplementation.java

@@ -0,0 +1,25 @@
+package lol.vera.spigot.implementation;
+
+import lol.vera.spigot.packet.MovementHandler;
+import lol.vera.spigot.packet.PacketHandler;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public interface SpigotImplementation {
+
+    void registerPacketHandler(JavaPlugin plugin, PacketHandler handler);
+
+    void registerMovementHandler(JavaPlugin plugin, MovementHandler handler);
+
+    class DEFAULT implements SpigotImplementation {
+
+        @Override
+        public void registerPacketHandler(JavaPlugin plugin, PacketHandler handler) {
+        }
+
+        @Override
+        public void registerMovementHandler(JavaPlugin plugin, MovementHandler handler) {
+        }
+
+    }
+
+}

src/main/java/lol/vera/spigot/packet/MovementHandler.java

@@ -0,0 +1,16 @@
+package lol.vera.spigot.packet;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+
+public interface MovementHandler {
+
+    /**
+     * @param player The {@link Player} who has moved
+     * @param to The {@link Location} the player came from
+     * @param from The {@link Location} the player is going to
+     * @param packet The flying packet
+     */
+    void handleMove(Player player, Location to, Location from, Object packet);
+
+}

src/main/java/lol/vera/spigot/packet/PacketHandler.java

@@ -0,0 +1,11 @@
+package lol.vera.spigot.packet;
+
+import org.bukkit.entity.Player;
+
+public interface PacketHandler {
+
+    boolean handleSent(Player player, Object packet);
+
+    boolean handleReceived(Player player, Object packet);
+
+}