Integrated NextcloudFileProviderKit Repository

[i2h3]

I have merged the NextcloudFileProviderKit repository into this desktop client repository and moved its contents into a subdirectory (shell_integration/MacOSX/NextcloudFileProviderKit) while retaining the Git history.

Closes https://github.com/nextcloud/nextcloudfileproviderkit/issues/136

Left To Do

• [ ] #9023, so the master of this repository works with the main of the integrated package repository.
• [ ] Migrate GitHub actions
• [ ] Fix build errors. The latest NextcloudFileProviderKit version assumes certain changes intended for the app sandbox. Probably a rebase on the i2h3/proper-macos-sandboxing branch is required.
• [ ] Check license conflicts

[i2h3]

• Due to the long history of the merged package project where unconventional commits were not rejected, they need to be ignored for once in this case.
• The DCO fails because one of my sign-offs was with an obfuscated GitHub mail address instead of my usual one.

[github-actions[bot]]

Artifact containing the AppImage: nextcloud-appimage-pr-9176.zip

Digest: sha256:494ed5b3b42dd272dd799da1992076b5df01a72b8995e94fa9e4baeca2deb50f

To test this change/fix you can download the above artifact file, unzip it, and run it.

Please make sure to quit your existing Nextcloud app and backup your data.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud