* Add infrastructure to poll joystick input and get ParamPackages
* Generalize the callbacks in configure_input.cpp and add buttons for analog sticks
* Use the polling classes in the input dialog
* Fix includes
* Formatting fix
* Include real header instead of forward declaring, to fix compiler error
* Split up pair and add deadzone for joystick configuration
* Pass ParamPackages by reference to callback
* fix formatting
* getPollers -> GetPollers
* Add forward declarations and simplify code a bit
* Update joysticks before opening them
* Fix mixup between joystick IDs and device indices
muemart
James Rowe
Dave Leaver
wwylele