Added recognition of the offset value in the UI. It will be displayed if available.
Caveat: Search will not take offset into account. A new year's picture taken in Sydney the 1st of January 2019 00:15:00 GMT+11, is technically taken in 31st of December 2018 in UTC. Therefore this picture won't show of in seaches where the after: parameter is set to 1st of january 2019.
This is both correct and wrong at the same time.
UTC-wise it is correct, local time it is not correct. I guess most people would find local time most untuitive, so there is room for improvement of the search. :)
Refactoring to async/await to solve race condition, also resolves error sometimes occuring with undefined values and resolves overwrite of xmp values.
xmp for image file has tag removed to validate additive tagging from both file xmp and sidecar xmp data.
Added ratings to xmp sidecar support, also added rating to bunny.mp4.xmp and a different rating in IMG_5910.jpg.xmp vs what is in the photo file to test if sidecar is functioning as primary.
