Added gamemode switching in config. Sending player abilities packet to disable flying in spectator mode

src/main/java/ru/nanit/limbo/protocol/packets/play/PacketPlayerAbilities.java

@@ -0,0 +1,31 @@
+package ru.nanit.limbo.protocol.packets.play;
+
+import ru.nanit.limbo.protocol.ByteMessage;
+import ru.nanit.limbo.protocol.PacketOut;
+
+public class PacketPlayerAbilities implements PacketOut {
+
+    private int flags = 0x02;
+    private float flyingSpeed = 0.0F;
+    private float fieldOfView = 0.1F;
+
+    public void setFlags(int flags) {
+        this.flags = flags;
+    }
+
+    public void setFlyingSpeed(float flyingSpeed) {
+        this.flyingSpeed = flyingSpeed;
+    }
+
+    public void setFieldOfView(float fieldOfView) {
+        this.fieldOfView = fieldOfView;
+    }
+
+    @Override
+    public void encode(ByteMessage msg) {
+        msg.writeByte(flags);
+        msg.writeFloat(flyingSpeed);
+        msg.writeFloat(fieldOfView);
+    }
+
+}

src/main/java/ru/nanit/limbo/protocol/registry/State.java

@@ -40,6 +40,7 @@ public enum State {
         {
             serverBound.register(0x10, PacketKeepAlive::new);
             clientBound.register(0x24, PacketJoinGame::new);
+            clientBound.register(0x30, PacketPlayerAbilities::new);
             clientBound.register(0x34, PacketPlayerPositionAndLook::new);
             clientBound.register(0x1F, PacketKeepAlive::new);
             clientBound.register(0x0E, PacketChatMessage::new);