Add autocomplete capability

[khsa1]

[jlinford]

Someone at ATPESC also asked for this feature.

[zbeekman]

I would love this too... I saw an interesting way to setup autocomplete in a REPL with python somewhere recently, but I don't remember where. Not sure if python can do this for a plain command line or if we need something like bash completions.

[zbeekman]

If we will need to use bash completions I can look into it at some point

[zbeekman]

OK, here are the links I was referring to above: https://opensource.com/article/17/5/4-practical-python-libraries

[zbeekman]

The article I linked above appears to deal only with REPL based interfaces. However, https://github.com/kislyuk/argcomplete is designed to work with argparse, which taucmdr is already using.