Update 3: Trading improvements and assorted fixes — Undholm Steam update #398899

Changes in this update: Gameplay: Cows and chickens now use the same taming system as other animals. After an animal trainer has tamed an animal (or after you have purchased an animal from a trader), you can tell it where to go by selecting it and right-clicking on the ground, same as dwarves. Note that many animals (like cows and deer) cannot climb ladders. Added "Mark as Enemy" action. This will manually mark a creature as an enemy of your colony -- soldiers will automatically attack if they're near enough, and all other dwarves will flee from them. Added "Ask to leave" action for NPC traders. Added Trader profession. Added ability to send your own traders to other colonies. This should make it easier to sell/purchase items instead of waiting for traders to come to you. To send one, select a settlement in the world map and use the "Send trader" option. This will immediately open the tr...