Print services functions

• NWCancelCapture(3nw)

• NWEndCapture(3nw)

• NWFlushCapture(3nw)

• NWGetBannerUserName(3nw)

• NWGetCaptureFlags(3nw)

• NWGetCaptureStatus(3nw)

• NWGetMaxPrinters(3nw)

• NWGetPrinterStrings(3nw)

• NWSetBannerUserName(3nw)

• NWSetCaptureFlags(3nw)

• NWSetPrinterStrings(3nw)

• NWStartFileCapture(3nw)

• NWStartQueueCapture(3nw)