Adding additional parsers for other localizations

[dgkf]

Changes

• Adds alternate grammars for English, Spanish and Chinese, each with their own set of keywords.
  • Note that this only affects input for now. When objects are printed to console they still use the English representations as these are hard-coded elsewhere.
• Adds actual CLI argument parsing, now using clap to handle a --locale flag on startup

to do:

• provide a better cli --help dialogue
• update demo website with localization setting

future work

• translate startup message
• localize output