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/coreplugin/mainwindow.cpp

@@ -942,6 +942,7 @@ void MainWindow::showNewItemDialog(const QString &title,
     // Scan for wizards matching the filter and pick one. Don't show
     // dialog if there is only one.
     IWizard *wizard = 0;
+    QString selectedPlatform;
     switch (wizards.size()) {
     case 0:
         break;
@@ -953,6 +954,7 @@ void MainWindow::showNewItemDialog(const QString &title,
         dlg.setWizards(wizards);
         dlg.setWindowTitle(title);
         wizard = dlg.showDialog();
+        selectedPlatform = dlg.selectedPlatform();
     }
         break;
     }
@@ -976,7 +978,7 @@ void MainWindow::showNewItemDialog(const QString &title,
             break;
         }
     }
-    wizard->runWizard(path, this);
+    wizard->runWizard(path, this, selectedPlatform);
 }
 
 bool MainWindow::showOptionsDialog(const QString &category,