SetBitMode
  Parameters: {$mode}
  Return Success: TRUE
  Return Failure: FALSE
  Purpose: API Method - See FT_SetBitMode().
  Note: The following EXPORTS for BitModes are available for convenience:
    PFT_BITMODE_RESET
    PFT_BITMODE_ASYNCBB
    PFT_BITMODE_MPSSE
    PFT_BITMODE_SYNCBB
    PFT_BITMODE_MHBEM
    PFT_BITMODE_FOISM
    PFT_BITMODE_CBUSBB