Changes from original

1. U8g2 instaed instead of U8glib. 
   1. Smooth screen refresh. 
   2. No distorted numbers. 
   3. No garbage on a border.
2. New date and time format 
   1. ISO date YYYY-MM-DD [Day] 
   2. Time with leading zeroesHH:MM:SS
3. Updated branding strings and logo

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