Refactor azalea-protocol (#190)

* start updating to 1.21.4

* fix block codegen and stop using block data from burger

* rename packet related modules and structs to be simpler

* ItemSlot -> ItemStack for more consistency with mojmap

* .get() -> .into_packet()

* simplify declare_state_packets by removing packet ids

* rename read_from and write_into to azalea_read and azalea_write

* rename McBufReadable and McBufWritable to AzaleaRead and AzaleaWrite

* McBuf -> AzBuf

* remove most uses of into_variant

* update codegen and use resourcelocation names for packets

* implement #[limit(i)] attribute for AzBuf derive macro

* fixes for 1.21.4

* fix examples

* update some physics code and fix ChatType

* remove unused imports in codegen

* re-add some things to migrate.py and update +mc version numbers automatically

* downgrade to 1.21.3 lol

2 files changed, 27 insertions, 0 deletions

diff --git a/azalea-protocol/src/packets/handshake/mod.rs b/azalea-protocol/src/packets/handshake/mod.rs
new file mode 100755
index 00000000..90a312e7
--- /dev/null
+++ b/azalea-protocol/src/packets/handshake/mod.rs
@@ -0,0 +1,12 @@
+// NOTE: This file is generated automatically by codegen/packet.py.
+// Don't edit it directly!
+
+use azalea_protocol_macros::declare_state_packets;
+
+declare_state_packets!(HandshakePacket,
+    Clientbound => [
+    ],
+    Serverbound => [
+        intention,
+    ]
+);
diff --git a/azalea-protocol/src/packets/handshake/s_intention.rs b/azalea-protocol/src/packets/handshake/s_intention.rs
new file mode 100755
index 00000000..566ada30
--- /dev/null
+++ b/azalea-protocol/src/packets/handshake/s_intention.rs
@@ -0,0 +1,15 @@
+use std::hash::Hash;
+
+use azalea_buf::AzBuf;
+use azalea_protocol_macros::ServerboundHandshakePacket;
+
+use crate::packets::ClientIntention;
+
+#[derive(Hash, Clone, Debug, AzBuf, ServerboundHandshakePacket)]
+pub struct ServerboundIntention {
+    #[var]
+    pub protocol_version: i32,
+    pub hostname: String,
+    pub port: u16,
+    pub intention: ClientIntention,
+}