started implementing the xinput joystick library, plus functions with test cases

[Andrew Fenn]

The following attached patches, is the beginning of the implementation
of the xinput joystick library. I have tested the following patches on
windows XP SP3 as well as a few games via wine.

Currently the library implements enough functionality to tell the
program that there are no joysticks plugged in (useful for programs
which crash because xinput dll can not be found).
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