(TextActor) Ensure TextAttachment is updated after SetTextStyle
(TextActor) Ensure TextAttachment is updated after SetTextStyle

DoRender in Scene graph text Renderer always had the same pixel size for different font sizes because TextChanged was not called in TextAttachment SetStyle

Change-Id: Ida7f58b4f62577256aecd2fc267210ff42ad260a
Signed-off-by: Agnelo Vaz <d0fa58ac5bbe69eb48f57743cdbf1057356aae0d@samsung.com>

dalihub/dali-core,pwisbey/dali-core,pwisbey/dali-core,pwisbey/dali-core,dalihub/dali-core,dalihub/dali-core,pwisbey/dali-core,dalihub/dali-core