fixes#171fixes#31
* Initial code. Compiles and passes unit tests.
* Moved average rating calculation from rating fetch to set rating function. Still only compiled and unit tested.
* Bug fixes
* Fixed bug in savePlayQueue. Removed unique_index for star / rating entries because it's not valid.
* Changed time format on stars to RFC3339Nano to match created date format.
* Lint fixes.
* More lint fixes.
* Removed add* functions and replaced with Preload.
* Fixed several bugs in handlers for getStarred and getStarred2.
* Fixed bug when using music folder ID.
Co-authored-by: Brian Doherty <brian@hplaptop.dohertyfamily.me>