The first beta release

Changelog

• Fixed the heading menu bug
• Implemented paragraph support for double-newline separation in HTML
• Implemented paragraph (larger) break on return key
• Added support for embedded lists
• Fixed the crash when pressing undo while uploading an image
• Added ability to update element attributes from the library client

See build details and artifacts at buddybuild:
https://dashboard.buddybuild.com/apps/5800168c52aea90100a973ed/build/58fe604408d9030001408fa3