Add more complete support for the CLI syntax

[boenrobot]

Right now, the constructor of a Request object is equivalent to using setCommand().

Having support for CLI arguments would make work with this class magnitudes easier.

One limitation that I don't see how to work around is the nameless arguments... commands would have to be explicit, like "/ping address=192.168.0.1" or something, but that's a minor issue IMHO.

[boenrobot]

Added such support to the upcoming release. Additional caveat is that the first argument MUST have a value, even if it's an empty one, although omitting the value is otherwise supported.