Add tab completion

[colonelpopcorn]

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The terminal should be able to autocomplete or show a list of close enough items to tab through. That way you can autocomplete predefined commands. In your example, you can create an array and do a switch/case or an includes call to determine if the right command was specified. You could even have this array be an object that could have a handler attached to be run when a match is found. Just a few thoughts, this looks great, thanks!

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