Non-US Keyboard layouts + Unicode

One issue with the Keyboard library is that it only works for 7-bit ASCII characters and only for the US keyboard layout. To work around the issue I wrote a library to add international keyboard layouts and Unicode character support.

I scraped the Microsoft website to get key mappings for every keyboard layout. The library includes a header (.h) file for each key mapping and you can include multiple mappings to select at run time. (No, I don't know of any way for the Arduino to detect the mapping currently active on the target Windows machine.)

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