Add stopAtNonDash property for commands

[ilg-ul]

When processing options for commands, stop at N-th argument without a dash (i.e. not an option, but a package or file name).

This is useful for use cases like:

xpx --verbose @xpack-dev-tools/ninja-build ninja --version

The desired behaviour is to stop parsing for options when encountering ninja, to avoid consuming --version which should be passed to the comand, not to xpx.