Show livestreams in categories with live channels & Misc livestream showing improvements

[ktprograms]

Highlights:

• Fetch content sources from remote if local cache decode fails.
• Content sources v2 API.
• Show livestreams in categories with live channels.
• Fix cells having white background in dark mode.

[ktprograms]

Note: lint errors on this PR should be fixed by #305 as they are the same errors.