UnitTests: disabled Given_items_Then_enumerate_by_priority

Download cache - Use ReadAsByteArrayAsync when no ProgressDownload is…

… needed luberda-molinet#449

FadeAnimationEnabledForCached is now independent of FadeAnimationEnabled

DownloadCache refactorings

Android: Fixed luberda-molinet#353 - incorrect aspect ratio when usin…

…g fade animation

Android: Fixed luberda-molinet#354 - Images in list getting mixed up

Possible fix for luberda-molinet#353

Configuration: Added ExecuteCallbacksOnUIThread property (default dis…

…abled)

Marked data resolvers methods as virtual for easier extensibility

iOS Sample project x64 support