-Adds RTL (Right-To-Left) support for all RTL languages

-Paragraphs containing RTL text are consistently aligned to the right and text is measured correctly when reshaped
-Supports reshaping (connecting) of standard Arabic letters, including Farsi, Kurdish, Turkish and Urdu
-Supports reshaping of supplement Arabic letters used in languages such as Farsi and Urdu
-Mirroring of symetric symbols such as '(' and ')' when surrouded by RTL text
-Tested by several Arabic native speakers

By Eyad Aboulouz.

Change-Id: Ifd3e24cde0c68c97245e97cf41b71c3701078e48