v0.7.0

Changelog:

New features:

• The extract_file and extract_files methods now decrypt files from the backup in chunks, to prevent memory exhaustion when decrypting particularly large files. Large files, for example the iOS Health database, previously required at least twice their file size of available RAM to decrypt successfully: now an a few hundred megabytes free RAM is sufficient.
• Added helper values for iCloud photos on the camera roll, provided by @john-corcoran.
• Provide sqlite3 cursor access to the temporary copy of the Manifest database via a new backup.manifest_db_cursor() context manager. This might make interactive exploration of the backup simpler.

v0.6.0...v0.7.0