* Add a DeployConfiguration class to hold settings related
to deployment.
* Add BuildStepsList to hold a list of buildsteps
* Update BuildConfiguration to use BuildStepLists instead of
manageing lists of buildsteps itself.
* Update BuildManager to use BuildStepLists in its interfaces
* Fix fallout introduced by API changes
* Update .user file to new way of storing settings
Task-number: QTCREATORBUG-1427
Task-number: QTCREATORBUG-1428
Task-number: QTCREATORBUG-1811
Task-number: QTCREATORBUG-1930
