BREAKING CHANGE: kosmorro script is renamed to kosmorro.py

guess output format based on output file extension

check for empty output file

default to .txt if no file extension provided

change default output format back to txt

add tests

update man page

fix default output format

directly return output dumper

use keys from dumpers in key error message

fix man pages

prevent output format from being overridden

use first dumper key as default format

update messages and formatting

update help message for format argument

specify list type in InvalidOutputFormat exception

make default output format more apparent

update messages

This reverts commit 6ffe0ad07b.

Co-authored-by: Damgermys <damhub28@gmail.com>

Co-authored-by: Damgermys <damhub28@gmail.com>

Co-authored-by: Damgermys <damhub28@gmail.com>

Co-authored-by: Damgermys <damhub28@gmail.com>

BREAKING CHANGE: on Ubuntu 20.04+, the `texlive-latex-extra` package is needed to generate the PDF output

You can now use the `--format=pdf` argument to save the data computed by
Kosmorro to a PDF file. The new `--output` argument must be given with
the export file path.

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.