Added wideqsh.py - a menu driven shell for wideq

[krocans]

Created simple menu-driven shell for navigating/changing device settings.
Hope somebody will find it useful.

[sampsyo]

Wow; that's cool! It would be great to avoid duplication of code between the current example script and this new, interactive one… maybe we should move some to a wideq.cli module, for example?

[krocans]

My vision also is to create some CLI which may be then called brom other programs/scripts or used interactively. Something like:

cli <device> - shows settings
cli <device> <setting> - shows 1 setting
cli <device> <setting> <value> - changes setting
cli (or cli -i) starts menu shell

Yes there is some copy-pasting from example.py :)
Unfortunately it's unpredictable when and how much time I will have for that so I've created pull request as-is to give you and community possibility to work on it.