v4.9.0

Features

• Add mjml-preset-core package, which contains all standard components, and can be passed to mjml-core's mjml2html. (thanks @TrySound)
• mj-include can now be used to include css and html files (ref #2026)
• Add specific media queries for thunderbird

Fixes

• mj-raw can now be used in mj-social
• Removed the media queries for owa as they're not needed anymore
• Improved mj-accordion documentation @GarryFlemings