Dethrace fails to find gamedata when started through the Launcher (on Macos)

[madebr]

From discord:

and launch it from terminal because there’s a bug where game fails to pick files otherwise

I remember reading somewhere macos sets the working directory to / or something similar. Or it adds some arguments? Idk, I don't use it.

I think we should detect this case, and use _NSGetExecutablePath to change the working directory.