Use Core::Id in project-related objects

Use Core::Id for all the project related objects in favor of plain
QStrings.

Change-Id: I790ab40cb29899efdb49c413a77609486f52e683
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/android/androidpackagecreationstep.h

@@ -107,7 +107,7 @@ private:
     void raiseError(const QString &shortMsg,
                     const QString &detailedMsg = QString());
 
-    static const QLatin1String CreatePackageId;
+    static const Core::Id CreatePackageId;
 
 private:
     QString m_keystorePath;