1.20.2 packet changes

gistfile1.txt

Play - toClient

	New Packets
		chunk_batch_finished - Marks the end of a chunk batch and 
			says how many chunks were in the batch 
			
			According to wiki.vg this is used with chunk_batch_start 
			and also chunk_batch_received to estimate the best chunks 
			per tick to send for your network speed.
		
		chunk_batch_start - Marks the start of a chunk batch. 
			Client should store the time it recieves this somewhere to use in the calculation
			of how many chunks to send per tick.
			
		ping_response - Like the old Pong packet but using a long.
		
		start_configutation - switchs connection state back to configuration mode
		
	Changed Packets	
		
		login - The one in the play state
			Removed Registry Codec - this is now sent during the configuration stage
			Added a doLimitedCrafting field
			Changed the order of the following fields
				worldType
				worldName
				hashedSeed
				gameMode
				previousGameMode
				
		Respawn 
			Changed the order of the fields:
				dataKept is now in a different location in the packet.
				
	
		update Advancements
			Criteria was removed as a concept.
				
		
	Removed Packets
		Feature Flags - This was removed from the play state, there exists 
			the same functionality in the new configuration state
				
Play - toServer
	
		New Packets
		
			chunk_batch_received
				Sent from the client after it gets  chunk_batch_finished packet.
					desired chunks per is sent to the server.
					
			configuration_acknowledged
				Sent to the server in response to a start_configutation packet
				
			ping_request - Like the old Ping packet but using a long.
				
				
				
Login - toCLient
	
	Changes
		login_success - now switches state to the configuration state instead of to the play state
		
		
Login - toServer
	New Packets

		login_acknowledged - Sent in response to the login success sent by the server (I am assuming before the state change to configuration)
		
	Changed Packets
	
		login_start
			playerUUID is no longer optional
			
			
Configuration State - to Client
	All packets are new
		Best to read the wiki.vg information on these.