Harvest Mission Fix

This mod will fix an issue that prevents harvest missions from being completed on certain maps. It will apply to all new contracts in single player or multiplayer games.
For single player games there is an optional debugging display that will monitor progress and can help identify other issues with yield or harvest mission completion. You can also test the completion of a mission by harvesting and delivering all crops from a field with a single key press! This action will be applied to whichever mission is currently selected in the debugging display.