+ PROTOCOL_VERSION 21:
+ TOCLIENT_BREATH
+ TOSERVER_BREATH
+ range added to ItemDefinition
+ drowning, leveled and liquid_range added to ContentFeatures
+ stepheight and collideWithObjects added to object properties
+ version, heat and humidity transfer in MapBock
+ automatic_face_movement_dir and automatic_face_movement_dir_offset
+ added to object properties
+ PROTOCOL_VERSION 22:
+ add swap_node
+ PROTOCOL_VERSION 23:
+ TOSERVER_CLIENT_READY
+ PROTOCOL_VERSION 24:
+ ContentFeatures version 7
+ ContentFeatures: change number of special tiles to 6 (CF_SPECIAL_COUNT)