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Bridges and Canals

Adds two new improvements, "Bridge" and "Canal", allowing land units to cross water and water units cross land. This includes trade units.

IMPROVEMENT - Bridge:
The core logic for this was borrowed from the Civil War Scenario but I had to make some adjustments to the pathfinding logic in the dll for land trade routes. It is built by a work boat which is consumed in the process.
- Allows land units to enter this tile.
- Available with Engineering.
- Requires two adjacent land tiles.
- Maintenance cost of 3 gold per turn.

IMPROVEMENT - Canal:
- Allows water units to enter this tile.
- Available with Machinery
- Maintenance cost of 3 gold per turn.


I had to make changes to the dll for both of these features so unfortunately this mod isn't compatible with anything else that modifies the dll. I've tried to make it easy for others to use the pathfinding logic in the dll. The Civil War scenario makes use of a field in the IMPROVEMENTS table called "AllowsWalkWater" to allow for land units to enter that water improvement. I've added a corresponding "AllowsSailLand" to allow for water units to enter that land improvement. Please feel free to make use of this dll in other mods. Just drop me a "thanks" somewhere.