Liquids

Liquids in Terraria vary individually but have these common properties:
 * Players entering/exiting liquids will make a splashing sound and appropriate animation.
 * Players submerged entirely in liquid will get the breath meter and may drown without appropriate action/equipment/buffs.
 * While in liquids player's will find their movement slowed.
 * Liquids will form an appropriate waterfall effect when a half block is retaining the pool. This effect is purely graphical and players cannot interact with the falling liquid.