QString: Use QChar where appropriate.

 * Add version number to .user-file.
 * Upgrade it from old versions.

Reviewed-by: dt

 * That is what everybody else is using now.

Reviewed-by: dt

 * This makes it easier to distinguish projects in the
   userfileaccessor

Reviewed-by: dt

Reviewed-by: dt

 * Make use of the ProjectConfiguration base class in the
   BuildConfigurations and update the factories accordingly.

Reviewed-by: dt

 * Use new BuildSteps interface (as seen in ProjectConfiguration).
 * Use new factory to construct/clone/restore them.

Reviewed-by: dt

Reviewed-by: dt

shared' libraries but not of 'static' dlls.

Done with: Thorbjorn

doing it in 1.3 as well to avoid possible later conflicts

We should not polute the Qml Qt 4.6 namespace

See BAUHAUS-322

We should enable it again after we don't know of any errors any more.

Done with: Thomas

Extend logic for mimetype matching in QmlJsEditor: Also
handle sub-mimetypes like x-application-qmlproject, which
extends x-application-qml.

We're converting the path to absolute ones in QmlProject anyway ...

Old format is still available as a fallback.

It's a hack. More proper solution to come.

Done-with: hjk

ModelNode::addChildNode() crashed