Klsframe

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- Fixed a bug in the component `cli.Menu.open` that duplicated the custom option entry
- Updated `cli.selectable_list`. Dictionaries are now printed like tables for better reading (see utils.dict_to_table())
- New function `cli.continue_or_exit`. Allows the user to continue or stop the execution immediately
- New module: `utilities.dataframe`. Auxiliary functions to work with pandas dataframes

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- Fixed a bug in the component cli.Menu.__init__() that forced all `MenuEntries.values` to be strings instead of objects

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- New fields in class cli.Menu: title and description. They provide some contextual info about the menu

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- Added utils.get_df_rows(). It retrieves a list of rows from a Pandas dataframe given their indexes

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- Bug fixed in the component cli.Menu.add_entries() that did not allowed to process lists of custom objects

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- Bug fixed in the component cli.Menu.add_entries() that did not allowed to pass a plain string list as a parameter