[0.013] OS gamepad mapping

bow action (LT), and menu navigation with Dpad are wrong on linux.
The mapping is probably broken, in a different way for mac aswell.
Workaround is to press "select" to use the bow and to always naviguate menus with joystick, but some buttons still provoke unwanted consequences: Dpad left make the avatar go backward, while Dpad right make's it go forward etc.

http://wiki.unity3d.com/index.php?title=Xbox360Controller

I suppose we need to build each version with different input settings.

The player already can adjust this in the input window: