* Modernize Whitespace token: basic lexer

* Modernize Whitespace token: bibtex lexer

* Modernize Whitespace token: boa lexer

* Modernize Whitespace token: capnproto lexer + new example

* Modernize Whitespace token: cddl lexer

* Modernize Whitespace token: chapel lexer

* Modernize Whitespace token: c_like lexer

* Modernize Whitespace token: configs lexer

* Modernize Whitespace token: console lexer

* Modernize Whitespace token: crystal lexer

* Modernize Whitespace token: csound lexer

* Modernize Whitespace token: css lexer

* Revert a change in basic lexer

pyupgrade is a tool to automatically upgrade syntax for newer versions
of the Python language.

The project has been Python 3 only since
35544e2fc6eed0ce4a27ec7285aac71ff0ddc473, allowing for several cleanups:

- Remove unnecessary "-*- coding: utf-8 -*-" cookie. Python 3 reads all
  source files as utf-8 by default.

- Replace IOError/EnvironmentError with OSError. Python 3 unified these
  exceptions. The old names are aliases only.

- Use the Python 3 shorter super() syntax.

- Remove "utf8" argument form encode/decode. In Python 3, this value is
  the default.

- Remove "r" from open() calls. In Python 3, this value is the default.

- Remove u prefix from Unicode strings. In Python 3, all strings are
  Unicode.

- Replace io.open() with builtin open(). In Python 3, these functions
  are functionally equivalent.

Co-authored-by: Matthäus G. Chajdas <Anteru@users.noreply.github.com>