Say hello to Streamer (tape) device support

Implements the mandatory and a few optional commands for tandberd see
https://bitsavers.org/pdf/tandbergData/TDC4100/6047-1_TDC-4100_SCSI-2_Interface_Functional_Specification_Aug1991.pdf
for more info.

Fixed #480

cpp/devices/scsi_command_util.cpp

@@ -104,12 +104,7 @@ void scsi_command_util::AddAppleVendorModePage(map<int, vector<byte>>& pages, bo
 	}
 }
 
-int scsi_command_util::GetInt24(span <const int> buf, int offset)
-{
-	assert(buf.size() > static_cast<size_t>(offset) + 2);
 
-	return (buf[offset] << 16) | (buf[offset + 1] << 8) | buf[offset + 2];
-}
 
 uint32_t scsi_command_util::GetInt32(span <const int> buf, int offset)
 {