Option to show name of current argument

[jmoore34]

A feature from zsh-autocomplete.

This is quite useful when it's tricky to remember the order of the arguments. For instance the argument order of git merge and git rebase can be tricky to remember since they're "reversed" in a way (git merge A B merges A into B, while git rebase A B rebases B on top of A).

Somewhat related: #356

[sholderbach]

That sounds like a nice addition. Would probably best be implemented as an additional tooltip/status bar widget with a corresponding trait to make the language specific feature implementable.