[data] Handle different cases of vertical text

[charlesmindee]

We need to keep in mind that we will come across 2 cases of vertical text:

• "Rotated" vertical text: horizontal text with a +/-90° rotation (rotated letters)

• "Truly" vertical text: a text with horizontal letters (unrotated letters), written from top to bottom

[charlesmindee]

Moving since to a discussion, since it is a long term and very opened issue.