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

Co-authored-by: Giacomo Zinetti <giacomo.zinetti@giko.it>

fix issue where auto-animate did not work when jumping three or more slides (i.e. longer than the view distance)

always use css transforms for presentation scaling (zoom has too many quirks even if it is slightly sharper on ldpi displays)

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