Add modifiers and mousebuttons to print_key_map #6

Now, only the 256 values long keymap is displayed. It would be good to also add the possible modifiers and the mousebuttons to that function.

These buttons were added to the help function of set and append in 44c542d99a. This is even more convenient than to add it to the list subcommand.

These buttons were added to the help function of `set` and `append` in 44c542d99a3a1800ab9486eca9e10ef89fee4592. This is even more convenient than to add it to the `list` subcommand.

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Add modifiers and mousebuttons to print_key_map #6