Add inter-bit delay

[dmitrodem]

Please add delay between bits in message for slow 1-wire devices. For example, inter-bit delay is needed to program RW1990 touch memory. For example, writing new ID on such key could be as simple as

#include <OneWire.h>

OneWire ds(10); 

static const byte rw1990_key[] = {0x01, 0x27, 0x4f, 0x27, 0x01, 0x00, 0x00, 0xd5};

void cmd_rw1990_write(void) {
  if (!ds.reset()) {
    return;
  }
  ds.write(0xd1);
  ds.write_bit(0);
  _delay_ms(10);

  if (!ds.reset()) {
    return;
  }
  ds.write(0xd5);
  ds.set_bit_delay(2000);
  for (uint8_t i = 0; i < 8; i++) {
    ds.write(~rw1990_key[i]);
  }
  ds.set_bit_delay(0);
  
  if (!ds.reset()) {
    return;
  }
  ds.write(0xd1);
  ds.write_bit(1);
  _delay_ms(10);
}

(much simpler than original code at https://habr.com/ru/post/260891/ )