only parse from and to dates when searching

toggle between date formats when searching

refactoring

change date formatting for searched events

raise exception when search dates not given

Updated by "Update PO files to match POT (msgmerge)" hook in Weblate.

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/

Currently translated at 46.2% (31 of 67 strings)

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/ru/

Currently translated at 73.1% (49 of 67 strings)

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/nl/

Currently translated at 41.7% (28 of 67 strings)

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/nb_NO/

Currently translated at 100.0% (67 of 67 strings)

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/fr/

Currently translated at 62.6% (42 of 67 strings)

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/es/

Currently translated at 100.0% (67 of 67 strings)

Translations are welcome at https://hosted.weblate.org/projects/kosmorro/cli/de/

BREAKING CHANGE: Docker support has been removed.
If you were using it, please migrate to [one of the other available options](https://kosmorro.space/cli/download/).

This reverts commit 6ffe0ad07b.

Using Ctrl+C to interrupt the program won't display a big ugly error
anymore.

BREAKING CHANGE: invoking kosmorro command without --latitude and
--longitude arguments will now only output the Moon phase and,
eventually, the events for the given date (or today if date not given).

BREAKING CHANGE: invoking kosmorro command with the --altitude argument
will now fail with an "unrecognized arguments" error.