New theme using color palette from [Dracula](https://draculatheme.com/)
dark editor theme available for quite a number of different
applications.

fix fullscreen issues; correct size in Safari, auto-focus presentation when entering fullscreen #3080

When embedding reveal in a website, this will help avoid global variable conflicts with other frameworks that use global styles via variables.

Fixed broken URL

auto-animate; carry forward fragment visibility, unmatched elements adhere to duration/delay attributes