v0.7.0.0

What's Changed:

• Discord webhook support for the newsletter.
• Test discord webhook button in plugin page.
• Giving options to user to make changes for the discord embed message.
• Plugin page changes w.r.t. discord webhook.
• Code restructuring for email and discord client which gives us an option to add additional client in future.
• Email Newsletter task generalize approach for all clients.
• Use of TMDB api to fetch the poster images url.
• Removal of Imgur & JF server which were being used as image host.
• Removal of Scrapper config from plugin page.
• Bug fixes