[svg] switch to builtin "event.lockInit" and "getTopLevelSlides"
[svg] switch to builtin "event.lockInit" and "getTopLevelSlides"

ProgRT/deck.js,twitwi/deck.js,alexjobs/deck.js-1,twitwi/deck.js,ProgRT/deck.js,alexjobs/deck.js-1,twitwi/deck.js,ProgRT/deck.js,alexjobs/deck.js-1