For 0.17 we should aim to use Ubuntu 18.04 for building. This will be the new LTS release of Ubuntu.
We skipped 16.04 because of problems with the windows binary (#8732) but this was solved in 16.10, so ruling out new issues, the way should be clear.

This means finally building with a new C++ compiler, binutils, etc. Also this will solve a known security issue with the NSIS windows installer.