feat: implement search command

[Pyxels]

This adds the search subcommand to search (case-insensitive) for strings in the descriptions and projects.

Problem

I found myself looking for descriptions to continue that weren't in the last 10 and I didn't know the exact wording of. Before, I usually opened the bartib file and searched there.

Solution

One can use bartib search <TERM> to search for a string in the description/project. All description/project pairs are returned that contain said <TERM>.

Examples

Example Images

Notes

I had to somewhat refactor the list_descriptions_and_projects function to avoid code repetition, please let me know if you'd like this handled differently.

Not sure if this is something you'd like, feel free to close/change.

[nikolassv]

Thank you for your pull request! This appears to be a useful feature. Unfortunately, I have not had the time yet to take a closer look. I will come back to it, as soon as I can

[nikolassv]

I really like the feature! I just added two minor changes:

• The search term can now contain wildcards "*" or "?"
• The search term is now required (a search without a term does not make much sense)