Package abstraction improvements

```toml
[[packages]]
name = "ripgrep"
arch = "ripgrep"
brew = "ripgrep"

[[packages]]
name = "neovim"
arch = "neovim"
brew = "neovim"

[[packages]]
name = "visual-studio-code"
arch = "visual-studio-code-bin"
brew_cask = "visual-studio-code"
```

dotsetup install packages --profile dev