* 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

Latest qt renamed qml executable back to qmlviewer, and also named
the executable again QML Viewer instead of Runtime/Launcher.

The run configuration id changed, leaving restored qmlproject without
any run configuration.

Reviewed-by: kkoehne

- It's QML, not Qml. But this is only the file format.
- The umbrella term is Quick (or Qt Quick, to be sorted out)

Putting every class in it's own files + avoid "using namespace"

Since the target names are translated, we cannot use the saved
display name from the user file.

Reviewed-by: Tobias Hunger

 * Ease cross device development by introducing 'targets' which
   group build- and runsettings that are valid for this one target

 Most of the kudos for the code review go to dt. Con, thorbjorn,
 ckandler and others did also review parts of this patch.

Reviewed-by: dt