Add more features to update providers.

[N0D4N]

General:

• [Feature] Add support for custom colors in updates #23

MyAnimeList:

• Show anime's seiyus; (Suggested by Чакс)
• Show anime's studio;
• Show manga's mangaka(s);
• Show genres;
• Show demographics (shonen, seinen, shoujo, josei);
• Show themes;
• Show description;
• Add ability to use english title instead of romaji one;
• Add support for favorite studios on Mal #120

Shikimori:

• Show manga's mangaka(s); (Suggested by Игнайт)
• Show anime's studio;
• Show genres;
• Show description;
• Split russian language support, for titles/names and other content;
• Add achievements to shikimori #443
• Track user's favourite ranobe on Shikimori #48

AniList:

• Show anime's seiyus;
• Display AniList staff major roles when adding or removing staff favourite #61