Immortals for X-COM Files

Adds one new race type and two new transformations to the game; adds exactly one to your starting base.

If killed select the "Resurrection" transformation. If severely injured but still alive, "Revivify" will reduce their remaining DAYS_WOUNDED to 1 (I can't figure out how to set it to 0, if anyone can please let me know).

Not eligible for any other transformations- trying to find a good way to fix this, but somewhat limited by the fact that I can't just `class Immortal extends Soldier`, or something like that. Maybe just write a script to manually edit all the relevant transformations in the base mod's files? That seems a bad way to do it.

But the mod works, to install just drop it in your `mods` folder next to `XComFiles` and start a new game.