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: I6077f50ad0fcc49abfadc75d9948ab63df829ff9 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/189948 Tested-by: Jenkins Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>