[Feature Request] Add command-line flags to COSMIC's apps

[LinuxBoy-96]

Command-line flags should be added for easier access to information. Flags such as:

--version -v --help

Of course, these should be added to all apps, modules, and tools such as:

cosmic-term cosmic-comp cosmic-files ...

[LinuxBoy-96]

I've created a pull request for that feature in cosmic-term. https://github.com/pop-os/cosmic-term/pull/452

If the devs like the structure of it, it will be applied to the others.