Implemented method to get max font size and revamped scanning of glyphs #488
Added convenience methods to get text blocks and paragraph style for line
Set up method to specify options for getting baseline origin of line based on previous one
Added positioning options enum
added min/max line height support and "normal"
an attachment should prevent a negative half leading from shifting lines up
removed premultiplying paragraph spacing with line height multiplier, this is apparently wrong
Merge branch 'od/issue_488' into develop