Virtualfish

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* Show warning if activated virtual environment name does not appear in prompt
* *Projects* and *Compatibility Aliases* plugins can be used together without specific loading order
* `compat_aliases` plugin: Only define `deactivate` when a virtual environment is active
* `global_requirements` plugin: Disable per session/invocation via environment variable
* Check `*.fish` file syntax during CI test runs

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* Ensure `vf addpath <path>` is compatible with Python 3
* Improve `vf activate` $PATH handling durability

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* First release under new stewardship by [Justin Mayer](https://justinmayer.com/)
* Find & use non-PATH Python interpreters via common paths/tools (Pyenv, Pythonz, etc.)
* Environment name no longer must be passed as last argument to `vf new` or `vf project`
* Add `--help` to `vf new` and `vf project`
* Manage `vf new` verbosity via `--quiet`, `--verbose`, & `--debug` options
* Upon environment activation, if `$VIRTUALENV/.project` exists, `cd` to directory specified within
* Use `trash` command (if available) to safely remove environments via `vf rm`
* Improve install command UX and add uninstall command
* Improve API of Fish subprocess control class
* Add tests for `vf activate`, `vf deactivate`, and `vf rm`
* Automate tests via GitHub Actions CI
* Automatically publish package releases upon PR merge via [AutoPub](https://github.com/autopub/autopub)
* Ensure external `cat` and `rm` command invocations are not aliased
* Fix autocomplete help text when `functions` prints comments
* Overhaul documentation

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* Switch to new install process that doesn’t invoke Python on shell session start
* Add _Environment_ plugin to set environment variables upon virtual environment activation
* Add _Update Python_ plugin to upgrade existing virtual environments to newer Python versions
* Add foundation for a test suite

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* Optionally create `$VIRTUALFISH_HOME` directory if it does not exist
* Add `VIRTUALFISH_PYTHON_EXEC` variable to track which Python interpreter was used to install VirtualFish

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* De-activate the currently-active virtual environment, if any, before creating a new one