ST7920_SPI_master library not using delays for glcd128x64

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For the sending commands, you can get away single byte transfers. But for data, it is much faster if you can transfer multiple bytes at a time

Maybe something like

void glcd_data(uint8_t * data, uint16_t len) {
    digitalWrite(CS_PIN, HIGH);
    for(uint16_t count=0; count<len; count++) {
  	SPI.transfer(DATA_MSK);
  	SPI.transfer(data[count] & 0xf0);
  	SPI.transfer(data[count] << 4);
     }
        digitalWrite(CS_PIN, LOW);
}
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