Improvement, Feature, and Resource mod 2016-10-05

This mod adds optional XML tags to:

• make an improvement require access to a bonus, in the same way that railroads require coal. The requirement may be that the bonus be accessible from the tile, from a neighboring tile, from the nearest city, from the capital, on any tile in the civilization, or any combination of these.
• make an improvement provide one or more resources, without needing to be on the corresponding bonus.
• make a feature the upgrade over time, like improvements can.

This download contains the new DLL and CIV4TerrainSchema.xml.

See the Forum thread: http://forums.civfanatics.com/showthread.php?t=192288