Add support for UTF8 parsing of bytes in `write` function

[forntoh]

I was searching for a clean solution for my library to support multiple languages for some time now, and today, while just searching LCD datasheets, I stumbled upon your library and it seemed to deliver everything I needed. I must say you did an amazing job here.

However I've been facing some issues to integrate it with my library.

In my library LcdMenu, each row of text is rendered character by character using the write method of the Lcd instance, I noticed that the symbols are not rendered because in this lib, the write function doesn't convert any bytes sent through it.

I tried switching from write(byte) to print(char) but instead it printed numbers on the display.

I tried extending this lib for that functionality, but I clearly do not understand the library enough to be able to do this yet.

Ref

• Renderer is responsible to render a line on the display (it renders char by char and includes indicators)
  CharacterDisplayRenderer.cpp
• DisplayInterface receives commands from renderer and forwards it to the display
  LiquidCrystal_I2CAdapter.h