Aerial Views screensaver

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* Added a (music) Now Playing overlay - thanks to @spocky for his help
* Added WebDAV + GIF support
* Short videos can be looped within a time limit
* Adjust times or disable fade in/out animations
* Overlays can auto-hide after timeout, revealed with button press
* D-pad buttons/directions can be fully customised
* New Japanese translation for comm. videos by Asako
* New Hebrew translation by @dikodahan
* Translations updated thanks to @peat80, @marcopar, TexetBoo, and José Manuel Lugones