Added Unicode set BasicMultilingualPlane (may also be referenced as BMP) representing the Basic Multilingual Plane (Unicode characters up to code point 65535). Can be used to parse most language characters, but omits emojis, wingdings, etc. Raised in discussion with Dave Tapley (issue Printables does not contain replacement character #392).

To address mypy confusion of pyparsing.Optional and typing.Optional resulting in error: "_SpecialForm" not callable message reported in issue Typo in an example code #365, fixed the import in exceptions.py. Nice sleuthing by Iwan Aucamp and Dominic Davis-Foster, thank you! (Removed definitions of OptionalType, DictType, and IterableType and replaced them with typing.Optional, typing.Dict, and typing.Iterable throughout.)

Fixed typo in jinja2 template for railroad diagrams, thanks for the catch Nioub (issue It's good to hear you are safe, but you are still missing your head #388).

Removed use of deprecated pkg_resources package in railroad diagramming code (issue RFE: Replace use of pkg_resources with importlib.metadata #391).

Updated bigquery_view_parser.py example to parse examples at https://cloud.google.com/bigquery/docs/reference/legacy-sql