Voice markup#12

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poretsky wants to merge 7 commits intogoogle:masterfrom

poretsky:voice_markup

Commits on Mar 20, 2020

Voice markup
poretsky
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Commits on Mar 22, 2020

Voice markup enhancement
poretsky
committed

Commits on Mar 24, 2020

Special case of decorated checkable elements
poretsky
committed

Commits on Mar 25, 2020

Commits on Mar 26, 2020

Voice for headers
poretsky
committed