[Docs] Updated documentation for 1.1.1 release
[Win] Joystick driver now reports hat positions
[Input] JoystickState.ToString now prints hat pos
[Input] JoystickHatState is now IEquatable
[Input] LegacyJoystickDriver now reports hat pos
[Win] Invert vertical axes to match 1.0 API

The 1.0 API defines +y as up and -y as down. This matches XInput but
disagrees with WinMM, where we have to invert the vertical axes.
Merge remote-tracking branch 'origin/issue64' into develop