Add underline to anchor in the markup processor
Add underline to anchor in the markup processor

With a recent change, the underline run provides a color property.
So, now we can support color underline for text anchor style.

Change-Id: I9068a7733c1031b60625cb8fb356ac189aa4ae35
Signed-off-by: Bowon Ryu <81ef83b0e730bb0994892ac8894b9df89cb62eed@samsung.com>

dalihub/dali-toolkit,dalihub/dali-toolkit,dalihub/dali-toolkit,dalihub/dali-toolkit