[NEW] games/wrath

Hi,

Here is a new port for the wrath-darkplaces engine [1]
which is used in the game WRATH: Aeon of Ruin.

Some notes about this:

- There is no release, so I used GH_COMMIT

- Pass port-lib-depends-check and portcheck

- I used games/xonotic as a reference for this port
since it is related to the darkplaces engine.

- I renamed the binary to wrath as a recommendation
here [2]

- I tested the three levels of the game on amd64

- In the game, I found an issue with the mouse when
you have different artifacts(3+) in your inventory
that only allows you to select the extreme left/right
artifact.

OK's? Comments?

[1] https://github.com/KillPixelGames/wrath-darkplaces
[2] https://github.com/KillPixelGames/wrath-darkplaces#running