Modify EEPROM content to reflect the possible settings
Add a buffer format function to query/write EEPROM instead of always
using string function to save space.
Update Reset/Print Configuration with new settings
Code Cleaning
Some settings stay default as no real add value currently to allow to
change them
Some functions are missing but can be added in ESP8266WiFiClass, but to
avoid to update main class, at each release as it is not implemented -
move them to wifi class
Basic Setting Function Save/Read from EEPROM
Connection to wifi according settings in EEPROM
Recovery Mode using GPIO2 just after module start to reset settings
