+ Add settable player stepheight using existing object property.
+ Breaks compatibility with older clients.
+ PROTOCOL VERSION 36:
+ Backwards compatibility drop
+ Add 'can_zoom' to player object properties
+ Add glow to object properties
+ Change TileDef serialization format.
+ Add world-aligned tiles.
+ Mod channels
+ Raise ObjectProperties version to 3 for removing 'can_zoom' and adding
+ 'zoom_fov'.
+ Nodebox version 5
+ Add disconnected nodeboxes
+ Add TOCLIENT_FORMSPEC_PREPEND
+ PROTOCOL VERSION 37:
+ Redo detached inventory sending
+ Add TOCLIENT_NODEMETA_CHANGED
+ New network float format
+ ContentFeatures version 13
+ Add full Euler rotations instead of just yaw
+ Add TOCLIENT_PLAYER_SPEED
+ PROTOCOL VERSION 38:
+ Incremental inventory sending mode
+ Unknown inventory serialization fields no longer throw an error
+ Mod-specific formspec version
+ Player FOV override API
+ "ephemeral" added to TOCLIENT_PLAY_SOUND
+ PROTOCOL VERSION 39:
+ Updated set_sky packet
+ Adds new sun, moon and stars packets