Alpha 12 release-472

Bug Fixes

 * Fixed bug that prevented shepherd from collecting animals when the pasture was fenced in.
 * Prevent animals from moving when they are being harvested (e.g. shearing sheep).
 * Fixed bug placing item when the ghost was invalid.
 * Fixed bug that duplicated and orphaned building placement tasks on load.
 * Fixed bug when item is destroyed while being placed in storage.
 * Fixed engine error that could result from an invalid rotation angle when placing items/templates.
 * Fixed bug when removing a farm while it is being worked on.
 * Fixed error that could occur at the end of some dialog trees.
 * Fixed cosmetic defect on the fine comfy bed.

Other Changes

 * Mining has been optimized further to take load off the AI code.