fix: make box-drawing tables opt-in and restore markdown compatibility#1

manascb1344 wants to merge 3 commits into

bquenin:feature/box-drawingbquenin/opencode-md-table-formatter:feature/box-drawingfrom

manascb1344:fix/pr-8-box-drawing-opt-inmanascb1344/opencode-md-table-formatter:fix/pr-8-box-drawing-opt-inCopy head branch name to clipboard