Double tap to zoom, Bug fixes

• Double tap to zoom in and out photos
• Fixes "recently updated album" icon displayed in black on iOS 9
• Fixes description of previewed photos/videos not readable in dark mode on iOS 9 to 12
• Fixes upload issues encountered with servers rejecting http requests sent without cookie
• Fixes JSON conversion problem encountered when uploading with the old API method
• Changes custom HTTP header names for lowering the probability of encountering problems
• Fixes a few crashes reported with TestFlight
• Some Objective-C files converted to Swift 5.4

Look at the list of issues closed by this release