Segments

Segment

stores one piece of text with all the styles applied to it.

Segment(text::Union{Segment, AbstractString}, markup::AbstractString)

Construct a Segment out of a plain string and a markup string with style info

Segment(text::AbstractString)

Construct a Segment out of a string with markup.

concatenate strings and segments

get_string_types(segments_vectors...)

Given a number of Segment[] vectors, get the AbstractString like type they're using. If they are all using normal String or Substring go with that, but if one of them is using a different string type, use it.