Redesing cover changing system.

Hopefully this one will be more reliable.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
ChannelBrowser: Implement dedicated cover page.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
CategoryVideoList: Implement dedicated cover

Signed-off-by: Peter Tworek <tworaz666@gmail.com>