Render image width/height to css property instead to tag attribute

Currently width and height properties of a style tag don't survive wysiwyg-editing:

[[image:picture.png||style="width:5cm;border:3pt solid red"]]

will be rendered to

style="border:3pt solid red"

To specify the dimension of an image by style properties has some advantages:

• The size will be the dimension of the image later output as print or pdf.
• The size may be specified in font related dimensions (em,ex,ch) allowing use of images like a special character of a font.
• There are css  units with better readability than pixels.

There are tricky workarounds - surviving wysiwyg editing:

inline:

This picture (% style="display:inline-block; width:3cm" %)[[image:picture.jpg||style="border:3pt solid red"]](%%) shows the effect.

not inline:

(% style="width:5cm" %)[[image:picture.png||style="border:3pt solid red"]]

But changing the methods would be more clearly.