Kodi 18.0 alpha1 has been tagged so master is now open for 18.0 alpha2 changes - this is now what we're working towards.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.