Fixes:
- Fixed some random null-related crashes caused by marking video segments
- Pressing the back button in fullscreen mode should no longer pause the video (for tablet/tv devices)
Changes: - Removed the Disable Tablet/TV UI extra settings in favor of the new Force Auto Fullscreen extra setting. Those old extra settings were causing a bunch of domino-effect issues. They were initially added as a quick hack for forcing fullscreen mode on tablets/tvs.
- Reduced the timeout for requesting video segments from the default 30 seconds to 3 seconds. This timeout might change several times in the future until a fully-asynchronous process of requesting segments is implemented.