Multiple minor bugs in text behaviour

[wiheto]

• [x] fix subplot title. Can intersect with figure when no template argument is given
• [ ] Legend font often too small
• [x] Legend title often intersecting with figure,
• [x] showcase image title too large
• [x] fix documentation and examples after subtitle/title change
• [x] if title is list, make it none and subtitles=title (will also fix old behaviour and make documentation correct)