Add Option for Shell Expansion

[8ware]

Aside from quotes, expansion of special characters like * or {} is sometimes useful, sometimes not. For example, using wildcards to specify a set of files to be committed in Git is pretty convenient. On the other hand, escaping all decorative characters is annoying when a phrase of an Taskwarrior item should be emphasized (e.g. *), quoted or bracketed (e.g. ()).

To activate shell expansion depending on the use case an option should be added.