This patch allows tools::PolyPolygon to be iterated using c++11's
fancy range-based for-loops. It also upgrades a bunch of old-style
for-loops iterating over polypolygons to the new style to make code
more readable.
Note that not all for-loops iterating over polypolygons have been
upgraded, as I didn't find a way to automatically find those. I just
did a few I found manually.
Change-Id: Ifa8d0d44e6f0aa28fdcfd87d70058b12f48c1349
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/168730
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins
cfe6ce1656