I2C LCD: code inside

[DVE]

Strings support added:

Usage is easy, example:

    import sys,  machine
    
    # Types: 1 - 128x32 I2C OLED Display, 2 - 128x64 I2C OLED Display
    displayType = 1 
    initialize(displayType)
    set_contrast(128) # 1-255
    displayOn()
    clearBuffer()
    addString(0, 0,  sys.platform + " " + sys.version)
    addString(0, 1,  "---")
    addString(0, 2,  "CPU: {} MHz".format(machine.freq()[0]/1000000))
    drawBuffer()