* Refactor and move `completion` package to `internal/completions`
* Move `cli` and `repotest` packages to `internal/cli`
* Use passed version information for `--version` flag
* Add simple test for completions package
* Add `asdf completion` command
* Move completion files to `cli/completions`
* Add completions for Bash, Zsh, Fish, Elvish, and Nushell
* Update Zsh completion code to work with new completion install method
* Remove old commands from help output
* Add message to `asdf update` command
* Explain why `asdf global` and `asdf local` have been removed
* Add reference argument to `git.Repoer.Clone` method
* Update `asdf plugin test` command to install specific ref of plugin if provided
* Update `asdf plugin update` command to run pre and post plugin update hooks, and `post-plugin-update` plugin callback
* Enable `plugin_update_command.bats` tests
* Correct the environment `bin/install` runs in
* Improve output of `asdf list all` command when plugin not found
* Update `asdf plugin test` command to install a tool version in the test
* Replace direct `fmt.Println()` usage in a test with `t.Log()`
* Rename `cmd` to `cli`
* Move asdf command from module root
* Fix some linter warnings, thus enabling some tests that were being skipped
* Fix `Makefile`
* Rename module to `github.com/asdf-vm/asdf`
* Fix `TestGetAllToolsAndVersionsInContent/returns_empty_list_with_found_true_and_no_error_when_empty_content`
* Rewrite `Unique()` to be a bit more straightforwards
* Get workflow checks passing again
toolversions.Unique is ever so slightly faster, technically.
```
goos: linux
goarch: amd64
pkg: github.com/asdf-vm/asdf/internal/toolversions
cpu: AMD Ryzen 9 3900X 12-Core Processor
│ /tmp/old.txt │ /tmp/new.txt │
│ sec/op │ sec/op vs base │
Unique-24 346.5n ± 1% 342.4n ± 1% -1.17% (p=0.027 n=10)
│ /tmp/old.txt │ /tmp/new.txt │
│ B/op │ B/op vs base │
Unique-24 160.0 ± 0% 160.0 ± 0% ~ (p=1.000 n=10) ¹
¹ all samples are equal
│ /tmp/old.txt │ /tmp/new.txt │
│ allocs/op │ allocs/op vs base │
Unique-24 3.000 ± 0% 3.000 ± 0% ~ (p=1.000 n=10) ¹
¹ all samples are equal
```
* Enable `install_command.bats` tests
* Update `versions.InstallVersion` function to accept `toolversions.Version` struct
* Remove download directory after install if not configured to keep it
* Add download callback requirement to list of breaking changes
* Add `--keep-download` flag to install command
* Get all `install_command.bats` tests passing
* Create `toolversions.ParseSlice` function
* Create `toolversions.Format` function
* Refactor `shims` package to use `toolversions.Version` struct
* Fix handling of path versions in `shims.FindExecutable` function
* Create `CurrentEnv` and `MergeEnv` helper functions
* Add another test for `paths.RemoveFromPath` function
* Move executable finding functions to shims package
* Correct PATH code for env and exec commands
* Create `CallbackPath` method on `Plugin` struct
* Correct behavior of `asdf shimversions` command
* Update `shims.FindExecutable` function to return plugin
* Create `repotest.WritePluginCallback` function
* Create `execenv` package for invoking `exec-env` plugin callback
* Make `MapToSlice` a public function
* Return resolved version from `shims.FindExecutable` function
* Create `shims.ExecutablePaths` function
* Enable `shim_env_command.bats` tests
* Implement `asdf env` command
* create `repotest.WritePluginCallback` function
* add test for `list-bin-paths` callback that returns non-existent path
* if directory name returned by `list-bin-paths` doesn't exist skip it
* Create asdf-version script to print formatted version
* Update Makefile to set main.version variable during build
* Improve help output formatting
* Update release-build workflow to set asdf version in binaries
* Get more shim_exec.bats tests passing by adding shebang lines to test scripts
* Disable shim_exec test case for scenario that is no longer possible
* Add documentation on another breaking change
* Create toolversions.Version struct and update code to use new struct
* Enable `remove_command.bats` tests
* Update `remove_command.bats` to use new command name
* Create `internal/data` package
* Use data package for install paths
* Get all asdf plugin remove command BATS tests passing
