V3.0

[badbyte7]

• Less global Variables for better reading.
• The structure has been changed for a better separation of concerns.
• Minor errors were fixed (e.g. fan time entry on startup).
• Language switch to english.

New features are added:

• Average value of the last 8 measurements is used, to get rid of wrong single reads.
• A minimum hold time for the fan is added, that it doesn't switch on/off too fast (additional to the hysteresis).
• A SD log entry is always written, if the fan state changes for a more accurate logging.
• A third display page was added for the average values.
• SD Log messages with detailed errors were added for better debugging.
• A kind of DHT22 reset was added, if consecutive reads return invalid values.

Things that where changed due to different Hardware:

• SD module
• RTC module
• Temperature and Humidity correction values.