At least some IDEs are confused by our multitude of `tools` namespaces, and show errors like `namespace "tools" is ambiguous`. This removes one such namespace. The idea is to drop all but the one in /tools (that has tools::Long and tools::Rectangle). Change-Id: I338b995a29fcfa7142933c195750292593a364ac Reviewed-on: https://gerrit.libreoffice.org/c/core/+/189959 Tested-by: Jenkins Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>