Update Downloader.py

Fix Prgressbar not show while streaming

[SystemInfo] add old canMode12 as information

[services] Add proper return values in start procedures

[Navigation] tryfix streaming

Revert "[SystemInfo] modify mode12"

[SystemInfo] modify mode12

add h10, h11

[skin] add missing fallback.font

[gb18030.h] merge remote

Revert "Streamlink additon (#2295)"

Revert "add missing alternativeurl"

Revert "[iservice] add alternativeurl"

Revert "modify notification"

Revert "[ChannelSelection] fix notifications"