revamp command processing

- Display the parameter name instead of the parameter type
  whenver users interact with commands. This makes it easy to
  enter commands just by their signature. We may want to expose type
  information in the command list, but some quick testing showed that
  this are rather intuitive anyways.
- Add shift tab backward cycling for the command completion.
- Use inspect.Signature instead of homebrew argument matching solution.
  This gets rid of quite a bit of cruft.
- Remove some type checking hacks in mitmproxy.types

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