feature request: header text orientation and header line height

[rzorzorzo]

first: thanks for you project.
I have a table with many columns and checkbox cells.
to save space i would like to keep the columns slim.
for this i need to be able to set the header text orientation and therefore also the header line height
setting the text orientation on the canvas ist possible.
see here:
https://stackoverflow.com/questions/3167928/drawing-rotated-text-on-a-html5-canvas

[ota-meshi]

Thank you for the feature request.
This feature is interesting, but for now it's a low priority for me.