Migrate from app.php to IBootstrap

[patschi]

• Resolves: #
• Target version: main

Summary

Migrated from app.php to IBootstrap. Tested:

1. App is loaded
2. Settings can be changed
3. Documents can be opened

My PHP might be a bit rusty and PHP as well as Nextcloud seems to be evolving quite quickly - please check the commit thoroughly and let me know about any feedback.

Fixes #353

TODO

n/a

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Documentation (manuals or wiki) has been updated or is not required

[juliushaertl]

Great, thanks a lot for your pull request and also the cleanup work on the issues. Looks good code wise but will give it a test run myself later this week.

[patschi]

Looks good code wise but will give it a test run myself later this week.

Thanks for checking so quick. I also tried to get seemingly simpler issues implemented - like OneNote support, what OOS can out-of-the-box. However the WOPI protocol and Office Online is such awful to troubleshoot, that I failed miserably after a few hours.

--
Related: nextcloud/server#32132

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[joshtrichards]

Superseded by #490. Closing this out.