Wizards: changes the structure of Wizards

This patch introduces platforms as a top level topic when choosing
a wizard. Also I changed the categories and priorities.

Details:

1. I did change the way the dialog/view is structured in newdialog.cpp

2. I added platformName() and supportsPlatform() to BaseQtVersion.
   I needed two functions because the Simulator does not provide a platform
   and therefore has no platformName but supports two platforms.
   I still have to turn the platform names into proper constants.

3. I changed the categories and priorities to get the layout that was
   discussed. (I had to touch quite alot of files but this is mostly trivial)

4. I added a combobox that allows filtering for platforms.

5. I added flags() to IWizard to indicate that a wizard is platform independent.

Change-Id: I86c7ad628a431ad06505c76580885c6e6c3ddc23
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>

src/plugins/vcsbase/basecheckoutwizard.cpp

@@ -124,7 +124,7 @@ void BaseCheckoutWizard::setId(const QString &id)
     d->id = id;
 }
 
-void BaseCheckoutWizard::runWizard(const QString &path, QWidget *parent)
+void BaseCheckoutWizard::runWizard(const QString &path, QWidget *parent, const QString & /*platform*/)
 {
     // Create dialog and launch
     d->parameterPages = createParameterPages(path);
@@ -152,6 +152,11 @@ Core::FeatureSet BaseCheckoutWizard::requiredFeatures() const
     return Core::FeatureSet();
 }
 
+Core::IWizard::WizardFlags BaseCheckoutWizard::flags() const
+{
+    return Core::IWizard::PlatformIndependent;
+}
+
 static inline QString msgNoProjectFiles(const QDir &dir, const QStringList &patterns)
 {
     return BaseCheckoutWizard::tr("Could not find any project files matching (%1) in the directory '%2'.").arg(patterns.join(QLatin1String(", ")), QDir::toNativeSeparators(dir.absolutePath()));