Oled i2c LCD 128x64 added

Hello,
I add support for i2c LCD "OLED"
Tries with Crius OLED, and adafruit OLED LCD.

To enable it:
in config file un-comment
//#define OLEDLCD  // Oled 128x64 i2c LCD (address 0x3C or 0x3D)
and modify 
#define I2CADRESS 0x27 to #define I2CADRESS 0x3c or 0x3d

Olivier