src: upstream_patches_ui: Add help option #795
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The kw upstream_patches_ui doesn't have a help option to inform the user about the command usage.
This commit adds a -h option that superficially tells what the feature is about.
Note: This commit also adds a --help option to show the man page of the feature, but, as there isn't a man page yet, using this option results in nothing. Also, the implementation follows the one done in the kw mail feature, as it is the most up-to-date one.
Closes: #793