CC-4873: Airtime takes 7 seconds to load 32K (very small) from db

Made improvement by accessing db just once to determine if each show instance is full or not
Merge branch '2.3.x' into devel
CC-4873: Airtime takes 7 seconds to load 32K (very small) from db
CC-4873: Airtime takes 7 seconds to load 32K (very small) from db

-added a 5 second grace period for checking if shows are partially filled
Merge branch '2.3.x' into devel
CC-4887: Show whether track is scheduled in the future on Library page
CC-4887: Show whether track is scheduled in the future on Library page
Merge branch 'cc-4887-show-whether-track-is-scheduled-in-the-future-on-Library-page' into devel