Noel's Earth 1939 v5b

v4b
- Replaces JFD's Japan with original Japan in an effort to solve science issue.
- Nuclear weapons cost more production.
- Add more startup navies for Japan.
- Disable Science victory.
- Rearranged mod files and minor bugs fixes.

- Add starting trade units for all countries, that may begin to conduct trade route on the next turn.
-Add Iowa-class Battleship for the US.