2.8.0

• security: alt-attributes were rendered unescaped in ten places - an alt containing a quote could inject markup into the email. same fix applied to the copyright suffix
• fixed gallery producing broken table markup: rows stayed unbalanced at 4, 6 and 7 photos, and incomplete rows were filled with the wrong number of cells
• button alignment emitted the enum name (align="RIGHT") instead of the css value
• txt-version: galleries and space-lines were dropped entirely, tables shipped a literal "TABLE IS NOT YET AVAILABLE ON TXT-EMAIL" placeholder - tables now render their rows, image-cells carry their url
• fixed ColorStyleSimple.getAllPresets() listing BLACK_STYLE twice while BLUE_STYLE was missing
• upgraded to colors 1.0.0, which corrects hex parsing: six-digit codes read only the first digit of each pair, so #5f7bb8 resolved to #5577bb. button colors change accordingly - custom hex colors now render as specified
• upgraded commonmark 0.30.0