Pvenv

.. _`Semantic Versioning`: https://semver.org/spec/v2.0.0.html

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Added
^^^^^
* Allow overriding env vars with a .d directory

Fixed
^^^^^
* Unset completely the new env vars

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Fixed
^^^^^
* Fixed `avenv` with multiple environment variables

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Fixed
^^^^^
* Fixed setting the project path when using `mkvenv`

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Fixed
^^^^^
* Fixed error messages when using `mkvenv`

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Added
^^^^^
* Added `rmvenv` to remove existing virtual environments
* Added `mkvenv` to create virtual environments
* Added `avenv` to activate virtual environments
* Added `dvenv` to deactivate virtual environments