walterroach c1f88b4a5f frontline refactoring
`FrontLine` is tightly coupled with `ConflictTheater`.
  Moved into the same module to prevent circular imports.

Moved `ConflictTheater.frontline_data` from class var
to instance var to allow save games to have different
versions of frontlines.
2020-11-15 22:08:18 -06:00
..
2020-11-15 22:08:18 -06:00
2020-11-07 02:13:17 +01:00
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