Take two: the text demo now shows:

- clipping
- arabic text
- rotated text

It shows this in a new window, subdivided into 8 demo screens to
cover all permutations of clipping, arabic and rotated text.

I've also clipped the main screen's boxes to make it look a little
neater.

Change-Id: Iaba1c29503266b72cbdcc2f48b309c28c94022b8
Reviewed-on: https://gerrit.libreoffice.org/14215Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>