Tlatoani: Aztec Cities News

Minor fixes for predator-hunting behaviours, possible crash due to trading posts' missing partners, etc.

Fixed initial tree-state for editor-made maps, allowed painting in springs

* Fix for potential crash related to razed/deleted objects persisting on plan map
* Fix for problems with random maps showing resources not present on terrain
* Fix for pathing attributes of aqueduct-ramps
* Removed first-aid behaviours for tamed animals
* Forced tribute and levy demands to arrive earlier in year
* Made casualty and captive-calculations for levies more generous
* Fix for default names of saved-games
* Other minor tweaks and fixes

* Fixes for error in trade-specification for certain campaign scenarios
* More fixes for goods-unit display in UI
* Other minor tweaks and fixes

Note: The bug in trade-specification/s may require restarting certain campaign scenarios, such as Coatitlan. Apologies for all the various main-branch hotfixes recently, I'm hoping to move feature work back onto the testing branch in future.

Allowed trade-goods to be specified for foreign cities in map editor (and saved/loaded correctly)