Add option to output in native characters

[BenOvermyer]

Add a flag that sets the generator to output native characters for languages which don't normally use English characters.

This will require adding new character sets for at least the following languages:

• Chinese (see https://github.com/wainshine/Chinese-Names-Corpus/tree/master/Chinese_Names_Corpus)
• Japanese
• Thai (already has Thai characters, needs English characters)
• Korean
• Russian (already has Russian characters, needs English characters)
• Ukrainian (already has Cyrillic characters, needs English characters)
• Mongolian (prefer Mongolian, not Cyrillic)
• Hindu
• Greek
• Arabic
• Estonian
• Serbian
• Nepalese