v1.2.0: More Flatcar Cargos

Adds more cargos to flatcars via containers.
Also sets train car type on a per-car basis rather than per-cargo. This will mean more varied car kinds in consists.

Full Changelog: v1.1.0...v1.2.0

v1.1.0: Logging

Some code organization, and some logging.

v1.0.0: Initial Release

Initial release.

• All tanker car loads in all other tankers.
• Containerized fluids and gases (e.g. CryoOxygen, Argon) in takers.
• Certain flatcar loads (e.g. Boards, SteelRolls) in box cars.

Full Changelog: https://github.com/bigyihsuan/DVCargoMod/commits/v1.0.0