Nicer command creation in QML

[jpnurmi]

The static IrcCommand::createXxx() convenience API might work fine in C++, but it's clumsy in QML given that one has to create a command instance to be able to call the methods. Perhaps a QML singleton (has to be a different name than IrcCommand to avoid clashes) or extend the Irc API in QML?

var cmd = IrcCommand.part(channel, reason) // clashes with the IrcCommand QML type name
var cmd = Irc.partCommand(channel, reason)

The latter kinda matches with the Qt QML "namespace" but then needs a QML specific documentation...