Reduce usage of app_version header

Most information is available via Q(Core|Gui)Application.
Add an AppInfo structure for the things that are not.

This avoids that the information ends up duplicated and
hardcoded in the plugins, which is not needed or desired.

Change-Id: I4d565e75c42a7b8facafa90c27096ea49359215d
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/mesonprojectmanager/mesonprojectmanager.qbs

@@ -15,7 +15,6 @@ Project {
         Depends { name: "CppEditor" }
         Depends { name: "ProjectExplorer" }
         Depends { name: "QtSupport" }
-        Depends { name: "app_version_header" }
 
         cpp.includePaths: "."
 

src/plugins/mesonprojectmanager/toolssettingsaccessor.cpp

@@ -6,11 +6,10 @@
 #include "mesonpluginconstants.h"
 #include "mesonprojectmanagertr.h"
 
-#include <app/app_version.h>
 #include <coreplugin/icore.h>
 #include <utils/fileutils.h>
 
-#include <QCoreApplication>
+#include <QGuiApplication>
 #include <QVariantMap>
 
 #include <iterator>
@@ -27,7 +26,7 @@ static QString entryName(int index)
 ToolsSettingsAccessor::ToolsSettingsAccessor()
 {
     setDocType("QtCreatorMesonTools");
-    setApplicationDisplayName(Core::Constants::IDE_DISPLAY_NAME);
+    setApplicationDisplayName(QGuiApplication::applicationDisplayName());
     setBaseFilePath(Core::ICore::userResourcePath(Constants::ToolsSettings::FILENAME));
 }