Add support for backgrounds in modal blocks#58

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PeeterPaal wants to merge 3 commits intomasterfrom 51_modal_block_backgrounds

+99-18

Commits on Sep 10, 2021

Initial modal blocks background support
PeeterPaal
committed

Commits on Sep 13, 2021

Columns now display images correctly
PeeterPaal
committed

Commits on Sep 14, 2021

Changed button placement, fixed block backgrounds
PeeterPaal
committed