Capture argument

[horkhe]

It would be nice to have an ability to capture the argument that was passed as particular function parameter during a test. I suggest the following API:

-spec capture(CallNumber:: first | last | all | pos_number(),
              Mod::atom(),
              Func::atom(),
              ParameterNumber::byte()) ->
        any() | [any()]

A list of values is returned if the first meck:capture/4 parameter is all.