Enhancement: add support of clear / clear yes

[wenzler]

As advised .. Thanks already! :)

Btw did you add stubs wherever you were unable to support it?
I just saw things like "unsupported [...] commands are ignored"

[wenzler]

Has this been removed from 4.2.5?
I do not see any support for module clear in there.

[xdelaruelle]

This new feature is not part of the 4.2 serie, so it is not there in 4.2.5. It will be part of 4.3 that will be out (4.3.0) in a few weeks.