When changing pointer cursor:
- use PDEV_HARDWARE_POINTER flag if using hardware pointer
- use PDEV_SOFTWARE_POINTER flag if using software pointer
- keep pfnMovePointer as an accelerator to driver function (if available) and never change it
- fix bug (2 pointers) when switching between hardware and software pointer
When moving pointer:
- check PDEV_HARDWARE_POINTER flag to know if we need to call the driver
- check PDEV_SOFTWARE_POINTER flag to know if we need to call EngMovePointer