ESP8266, OLED, recursive menus and bug fixes
This release provides several major improvements and some bug fixes:
- ESP8266 boards are now properly supported including PROGMEM and Wifi.
- OLED SSD1306 displays now tested as working with AdaGFX driver.
- Ability to handle more submenu nesting (defaults to 4 EG: Root -> level1 -> level2 -> level3)
- Ability to suppress the callback when calling a setter function.
- Select button no longer triggers more than once, back function mapped to long press.
- There was a bug in the fastltoa functions where very large numbers caused non-numeric characters to be displayed.