🐛 Fix hash of binary files in cache service

[misode]

• Fixes Binary files are not hashed correctly in CacheService #1706
• Also fixes the TODO not hashing on every file change
• Flush the dirty files list every so often (once it reaches a limit for example), to avoid having to do all that work at once when saving the cache

Also slightly tweaks the auto-cache interval behavior. The timer will now only start when the project is ready, changed the interval from 10 minutes to 5 minutes, and the project will now be cached immediately after ready, instead of having to wait potentially 10 minutes.