Asynchronous 1-wire reading

[krzbor]

Currently, 1-wire is read synchronously, which means the program is paused for up to 750ms. During this pause, a yield is called, ensuring that WiFi works correctly. However, other issues may arise, such as UART read buffer overflow.
I have modified the code so that everything operates asynchronously.
The previous solution to this problem contained a bug:
if ((DALLASASYNC) && ((unsigned long)(millis() - dallasTimer) > ((1000 * dallasTimerWait) - 1000)) ) {
DS18B20.requestTemperatures(); // get temperatures for next run 1 second before getting the temperatures (async)
}
The author assumed the code would execute only once, while in reality, it was executed multiple times per second before the reading.

[IgorYbema]

Thanks for finding that bug. I added ASYNC before indeed but I remember I didn't get the result I was expecting back then and forget about bughunting later. I'll review the code.

[Egyras]

Thanks for finding that bug. I added ASYNC before indeed but I remember I didn't get the result I was expecting back then and forget about bughunting later. I'll review the code.

Merge this pull ? :)