Alpha 12 release-463

Bug Fixes

 * Fixed shepherds not shearing sheep.
 * Fixed shepherds gliding when collecting animals.
 * Fixed bug that prevented harvesting tasks from being cancelled.
 * Correctly show the required resources when designing custom buildings. Previously, it would routinely ignore added windows, doors, and fixtures.
 * Fixed engine error in ‘set_contributes_to_score’.
 * Fixed disappearing rows when trying to close the party windows with the ‘ESC’ key.