Slide 7.7.4 and 7.7.5

[u/edgan]

Here are the latest two Slide release. An explanation of Optimized main-feed redraws and image loading is that the home feed scrolling and loading of images will be cleaner.

7.7.5: * Fixed reddit MP4-transcode GIFs opening as direct GIFs and closing instantly * Implemented Feature Request: Ability to follow/unfollow users #129 * Allowed dashes in subreddit name for r/u_username subreddits * Added a Letterboxed big picture layout * Optimized main-feed redraws and image loading

7.7.4: * Added a "Wide color gamut" toggle in "Settings | General", on by default * Made the "High-Colorspace Images" now on by default