This is a revision for testing https://github.com/na-Itms/0ad/tree/premake5.
Review will be eased by using the github branch. Also, this revision doesn't include the new premake files, in order to avoid cluttering Phabricator...
This revision is mainly aimed at automatically testing that the premake5 support doesn't break anything with premake4. It is also a small proof-of-concept of how we can integrate build system changes in the new Phabricator workflow.