Document custom versioning support using directory to save previous versions

[dkocher]

• [x] https://docs.cyberduck.io/mountainduck/versions/
• [x] https://docs.cyberduck.io/cyberduck/info/#versions
• [x] https://docs.cyberduck.io/cyberduck/edit/

Depends on ^1.

• Protocol support matrix (only enabled for protocols with no native versioning e.g. FTP, SFTP, WebDAV, OpenStack Swift)
• .duckversions folder created in every folder with previous versions saved
• Previous versions are saved with timestamp in filename pattern like filename.extension → filename-20230906102017.762.extension
• Allows to restore previous versions in Info → Versions.
• Can exclude files from versioning with versioning.include.regex=.*
• Enabled with versioning.enable=true in file transfers. Applies to existing files when choosing Preferences → Transfers → General → Uploads → Existing Files: (Overwrite|Compare)
• Enabled with editor.upload.file.versioning=truewhen editing files. Mapped to Preferences → Editor → Enable Versioning with iterate-ch/cyberduck#15137
• Only keep most recent versions with default versioning.limit=5. Previous versions exceeding the limit are deleted after an upload.