Added 50kHz operation mode for I2C/Wire library #3401
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When using Apollon77's library for Miceuz I2C soil moisture sensor (https://github.com/Apollon77/I2CSoilMoistureSensor) I recognized that for longer cables between the sensor and the ESP8266 (Wemos D1 mini), in my case 1m, I got invalid readings from the sensor. I was able to solve this issue by slowing the I2C bus down to roughly 50kHZ.
This patch is needed to change the bus speed to a value this low. I don't have the equipment to measure the actual bus speed, so my twi_dcount are guesses. Still I would like to see this patch merged as it solved the issue I had with the sensor and might be beneficial for others