☂️File formats - importing and exporting

[claws99]

Is your feature request related to a problem? Please describe

No response

Describe your feature request!

umbrella issue for importing and exporting various file formats. This helps the app work nice with other notetaking apps

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1. [Feature request]: Xournal++ compatibility #314
   enhancement good first issue +2
   
2. [Feature request]: Implement OneNote to Butterfly migration #427
   enhancement good first issue +2
   
3. [Feature request]: Conversion with Saber #484
   enhancement good first issue +2
   

[CodeDoctorDE]

All migrations are marked as good first issue Good for newcomers for people that wants to contribute.
You don't need to be familiar with the whole code, only the file format classes inside api.
They are not associated with a milestone to give a bit more time for people that wants to help.

Please comment on this issue if you want to start, then I can assign you to this issue