Explicitly assign packet IDs (not implicitly from ordering in source code) (#19)

The packet IDs were assigned by the `create_ids!` macro, in the order they are in
the source code. This reduces flexibility for adopting new protocols, since the
packets can be reordered arbitrarily. Part of https://github.com/iceiix/steven/issues/18

src/protocol/mod.rs

@@ -81,8 +81,125 @@ macro_rules! state_packets {
                 use crate::shared::Position;
 
 
+                #[allow(non_upper_case_globals)]
                 pub mod internal_ids {
-                    create_ids!(i32, $($name),*);
+pub const Handshake: i32 = 0x00;
+pub const TeleportConfirm: i32 = 0x00;
+pub const TabComplete: i32 = 0x01;
+pub const ChatMessage: i32 = 0x02;
+pub const ClientStatus: i32 = 0x03;
+pub const ClientSettings: i32 = 0x04;
+pub const ConfirmTransactionServerbound: i32 = 0x05;
+pub const EnchantItem: i32 = 0x06;
+pub const ClickWindow: i32 = 0x07;
+pub const CloseWindow: i32 = 0x08;
+pub const PluginMessageServerbound: i32 = 0x09;
+pub const UseEntity: i32 = 0x0a;
+pub const KeepAliveServerbound: i32 = 0x0b;
+pub const PlayerPosition: i32 = 0x0c;
+pub const PlayerPositionLook: i32 = 0x0d;
+pub const PlayerLook: i32 = 0x0e;
+pub const Player: i32 = 0x0f;
+pub const VehicleMove: i32 = 0x10;
+pub const SteerBoat: i32 = 0x11;
+pub const ClientAbilities: i32 = 0x12;
+pub const PlayerDigging: i32 = 0x13;
+pub const PlayerAction: i32 = 0x14;
+pub const SteerVehicle: i32 = 0x15;
+pub const ResourcePackStatus: i32 = 0x16;
+pub const HeldItemChange: i32 = 0x17;
+pub const CreativeInventoryAction: i32 = 0x18;
+pub const SetSign: i32 = 0x19;
+pub const ArmSwing: i32 = 0x1a;
+pub const SpectateTeleport: i32 = 0x1b;
+pub const PlayerBlockPlacement: i32 = 0x1c;
+pub const UseItem: i32 = 0x1d;
+pub const SpawnObject: i32 = 0x00;
+pub const SpawnExperienceOrb: i32 = 0x01;
+pub const SpawnGlobalEntity: i32 = 0x02;
+pub const SpawnMob: i32 = 0x03;
+pub const SpawnPainting: i32 = 0x04;
+pub const SpawnPlayer: i32 = 0x05;
+pub const Animation: i32 = 0x06;
+pub const Statistics: i32 = 0x07;
+pub const BlockBreakAnimation: i32 = 0x08;
+pub const UpdateBlockEntity: i32 = 0x09;
+pub const BlockAction: i32 = 0x0a;
+pub const BlockChange: i32 = 0x0b;
+pub const BossBar: i32 = 0x0c;
+pub const ServerDifficulty: i32 = 0x0d;
+pub const TabCompleteReply: i32 = 0x0e;
+pub const ServerMessage: i32 = 0x0f;
+pub const MultiBlockChange: i32 = 0x10;
+pub const ConfirmTransaction: i32 = 0x11;
+pub const WindowClose: i32 = 0x12;
+pub const WindowOpen: i32 = 0x13;
+pub const WindowItems: i32 = 0x14;
+pub const WindowProperty: i32 = 0x15;
+pub const WindowSetSlot: i32 = 0x16;
+pub const SetCooldown: i32 = 0x17;
+pub const PluginMessageClientbound: i32 = 0x18;
+pub const NamedSoundEffect: i32 = 0x19;
+pub const Disconnect: i32 = 0x1a;
+pub const EntityAction: i32 = 0x1b;
+pub const Explosion: i32 = 0x1c;
+pub const ChunkUnload: i32 = 0x1d;
+pub const ChangeGameState: i32 = 0x1e;
+pub const KeepAliveClientbound: i32 = 0x1f;
+pub const ChunkData: i32 = 0x20;
+pub const Effect: i32 = 0x21;
+pub const Particle: i32 = 0x22;
+pub const JoinGame: i32 = 0x23;
+pub const Maps: i32 = 0x24;
+pub const EntityMove: i32 = 0x25;
+pub const EntityLookAndMove: i32 = 0x26;
+pub const EntityLook: i32 = 0x27;
+pub const Entity: i32 = 0x28;
+pub const VehicleTeleport: i32 = 0x29;
+pub const SignEditorOpen: i32 = 0x2a;
+pub const PlayerAbilities: i32 = 0x2b;
+pub const CombatEvent: i32 = 0x2c;
+pub const PlayerInfo: i32 = 0x2d;
+pub const TeleportPlayer: i32 = 0x2e;
+pub const EntityUsedBed: i32 = 0x2f;
+pub const EntityDestroy: i32 = 0x30;
+pub const EntityRemoveEffect: i32 = 0x31;
+pub const ResourcePackSend: i32 = 0x32;
+pub const Respawn: i32 = 0x33;
+pub const EntityHeadLook: i32 = 0x34;
+pub const WorldBorder: i32 = 0x35;
+pub const Camera: i32 = 0x36;
+pub const SetCurrentHotbarSlot: i32 = 0x37;
+pub const ScoreboardDisplay: i32 = 0x38;
+pub const EntityMetadata: i32 = 0x39;
+pub const EntityAttach: i32 = 0x3a;
+pub const EntityVelocity: i32 = 0x3b;
+pub const EntityEquipment: i32 = 0x3c;
+pub const SetExperience: i32 = 0x3d;
+pub const UpdateHealth: i32 = 0x3e;
+pub const ScoreboardObjective: i32 = 0x3f;
+pub const SetPassengers: i32 = 0x40;
+pub const Teams: i32 = 0x41;
+pub const UpdateScore: i32 = 0x42;
+pub const SpawnPosition: i32 = 0x43;
+pub const TimeUpdate: i32 = 0x44;
+pub const Title: i32 = 0x45;
+pub const SoundEffect: i32 = 0x46;
+pub const PlayerListHeaderFooter: i32 = 0x47;
+pub const CollectItem: i32 = 0x48;
+pub const EntityTeleport: i32 = 0x49;
+pub const EntityProperties: i32 = 0x4a;
+pub const EntityEffect: i32 = 0x4b;
+pub const LoginStart: i32 = 0x00;
+pub const EncryptionResponse: i32 = 0x01;
+pub const LoginDisconnect: i32 = 0x00;
+pub const EncryptionRequest: i32 = 0x01;
+pub const LoginSuccess: i32 = 0x02;
+pub const SetInitialCompression: i32 = 0x03;
+pub const StatusRequest: i32 = 0x00;
+pub const StatusPing: i32 = 0x01;
+pub const StatusResponse: i32 = 0x00;
+pub const StatusPong: i32 = 0x01;
                 }
 
                 $(