adjusted outlines on trees
added missing message at the beginning of the campaign
added tooltips at UI elements in Trade tab of Market with description of mechanic
increased visibility of several texts that appear when View is empty (Trade tab at Market modal and several Managers modals)
changed staff and vehicle target destination when moving to field to reduce moving through buildings (previously staff would search for closest road node to field, now they will pick closest road node to center of the field)
changed step in Europe campaign to show pointers on all "Hire" buttons instead of first to reduce confusion
fixed training UI elements "blinking" when opening window
fixed phantom resources being left at warehouses after end of field calls