Changes

• If waifu2x-ncnn-vulkan fails an upscale, the error is caught at a lower level, and the error messege is printed to console.
• Added hwencoding in ffmpeg for both re-encode video and pipe-ing to video. Will see if I'll leave it in for pipe-ing to video, as it uses GPU, but who knows, it may be faster. Expect faster dandere2x re-encoding videos now.
• Prints out ffmpeg windows when re-encoding video, since users have been asking if dandere2x crashed.
• Better console logging, now with a "root" logger, for all dandere2x logs that don't belong to a specific video.