* Create help package
* Add help command
* Enable help command BATS tests
* Implement functions in help package
* Write tests
* Correct function call in `installPlugin` test helper in shims package
* Refactor config package so default settings are always used with config file not loaded
* Update `findVersionsInDir` to check legacy files
* Refactor functions in internal/resolve package to return `ToolVersion` structs instead of version slices
* Refactor `findVersionsInEnv` function to return env variable name
* Create `resolve.Version` function