Add support for missing CLI options

[DeutscheGabanna]

Program now (hopefully) correctly responds to options that have been part of the help, but did not have any implementation:

• prefix
• suffix
• auto-reject all file conflicts
• auto-accept all file overwrites

Contents (#25)

New features

• Auto-accept or auto-refuse writing over existing files in case of conflict

Enhancements

• Filter out duplicate logs

Fixes

• Use custom prefix and suffix in entry headings if set
• typo in Librarian class
• Adjust expected files so that they reflect actual proper output

Refactoring

• Handle .md files in a dedicated class

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/daylio_to_md
errors.py					41-47
group.py					140
journal_entry.py
librarian.py					209-245, 251, 293
utils.py					326
src/daylio_to_md/entry
mood.py
tests
test_journal_entry.py
test_output.py
Project Total

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