* Fix issues with new typing Union syntax (Py310)
* Upgrade astroid to 2.14.1

- Refactor Classes which inherit from `object`.
- Remove `import print_function from __future__`.
- Remove assignments to `__revision__` from the functional test module when it is never used throughout the module.

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

* Add ``confidence`` to all expected functional test outputs
* Make OutputLine accept end_line and end_column

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

It's possible to use the python3 porting checker from
an older pylint version. But it's not evolving anymore
and was costing resource to maintain.

* Add unspecified-encoding checker #3826
This adds an unspecified-encoding checker that adds a warning
whenever open() is called without an explicit encoding argument.
This closes #3826

* Update tests to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added, or the message has been
disabled.
This also includes small linting changes to a small number
of tests. Their test-data has been updated to reflect new line numbers.

* Update scripts to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added.

* Update pylint to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added.

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

Also fix some superfluous lines encountered along the way

The API of isort 5 (released on 2020-07-04) is completely different.
We must still support isort 4 because isort 5 dropped the
compatibility with Python 3.5, which pylint still supports.

Note about the `known-standard-library` option: it has been included
in pylint for years. Until now, it was mapped with the option of the
same name in isort. However, isort 5 has changed the meaning of this
option (see https://timothycrosley.github.io/isort/docs/upgrade_guides/5.0.0/#known_standard_library).

Most users of pylint want the meaning of the new
`extra-standard-library` option. To avoid a breaking change in pylint,
the `known-standard-library` pylint option is now mapped to
`known-standard-library` in isort 4, and `extra-standard-library` in
isort 5. Users that really want the _new_ meaning of
`known-standard-library` in isort 4 must disable the
`wrong-import-order` check in pylint and run isort manually, outside
of pylint.

Fix #3722.

Certain checks such as relative-import, invalid-encoded-data and missing-super-argument
were removed as they no longer make sense on Python 3.