[Feature Request] Nightly incremental Import of Metadata

[abillauer]

It would be cool to have a feature that "Imports Metadata on Library Scan" between certain hours at night every night. This would allow for the library to be fully scanned over time when "Import Metadata on Library Scan" is unchecked. The idea is that the each night the job would pick off from where it left off the night before.

This would allow for the full use of codex's feature set while minimizing the hit at library scan and import of new books. It would also allow the scan to run at times when the library is not that active and the hit to resources can be planned.

The idea is similar in concept to Plex's building up chapter marks or video thumbnails as a scheduled task each night.

Just a thought. Thanks for all the hard work on Codex!!