If they are released with the deallocation of CInputManager, we might
run into global deallocation hell.
Also on Windows release all DirectX devices before COM library is closed.
ref T391
Using and linking against DirectInput libraries directly caused dinput.dll
to be loaded at startup time. Windows 10 kills applications started from
services (as the Jenkins slave service) that load dinput.dll.
This commit also adds some safety in case no helper windows could be created.
This includes a major refactoring of the Linux and Windows implementations
Each joystick device is now its own QObject. They all setup their own
native device instances and poll the button states.
On Windows, COM initialization has been removed since it caused segfaults
while releasing the DirectInput8 instance.
ref T254
