Text decoration limitations (skia)

[softmarshmallow]

There are limitations with text rendering, mostly with its extended usage.
We basically have to build our own, to fully support major text-related css properties.

This issue contains the list of problems found. feel free to add more comments around it.

• text-decoration-color limitation.
  • does not support other then fixed color (gradients, images, etc.)
• multiple decorations are not supported
  • underline with line trhrough
• text-decoration-thickness limitations
  • style=dotted/wavy/dashed should scale both in xy no only y. - skia only scales in y.
• paint(s) limitation
  • the gradient requires to be passed with distinct size, where size is measured after the layout(), which means we have to rely on canvas.draw_glyphs_at, which drops the native decoration support