Adds 1.7.10 protocol version 5 support, a major update with significant changes.
Expands https://github.com/iceiix/steven/issues/18 Enhance protocol support
* Add v1_7_10 protocol packet structures and IDs
* EncryptionRequest/Response i16 variant in login protocol
* 1.7.10 slot NBT data parsing
* Support both 1.7/1.8+ item::Stack in read_from, using if protocol_verson
* 1.7.10 chunk format support, ChunkDataBulk_17 and ChunkData_17
* Extract dirty_chunks_by_bitmask from load_chunks17/18/19
* Implement keepalive i32 handler
* Send PlayerPositionLook_HeadY
* Send PlayerBlockPlacement_u8_Item_u8y
* Handle JoinGame_i8_NoDebug
* Handle SpawnPlayer_i32_HeldItem_String
* BlockChange_u8, MultiBlockChange_i16, UpdateBlockEntity_Data, EntityMove_i8_i32_NoGround, EntityLook_i32_NoGround, EntityLookAndMove_i8_i32_NoGround
* UpdateSign_u16, PlayerInfo_String, EntityDestroy_u8, EntityTeleport_i32_i32_NoGround
* Send feet_y = head_y - 1.62, fixes Illegal stance
https://wiki.vg/index.php?title=Protocol&oldid=6003#Player_Position
> Updates the players XYZ position on the server. If HeadY - FeetY is less than 0.1 or greater than 1.65, the stance is illegal and the client will be kicked with the message “Illegal Stance”.
> Absolute feet position, normally HeadY - 1.62. Used to modify the players bounding box when going up stairs, crouching, etc…
* Set on_ground = true in entity teleport, fixes bouncing
* Implement block change, fix metadata/id packing, bounce _u8 through on_block_change
* Implement on_multi_block_change_u16, used with explosions
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