Support clone from the command line.

I like how when cloning a repository SmartGit populates the clone url from the clipboard. What would also be nice would be if there was a --clone command line option that would launch the clone dialog using the current directory as the default location in which to create the cloned repository.

This would be especially useful as on Linux SmartGit doesn't seem to have any file manager integration so currently the only way to clone in SmartGit is to open SmartGit, launch the clone dialog, then use the folder explorer to choose where to put the cloned repo. Currently it's quicker and easier to clone using the git cli than to use SmartGit.