Move C++ mime types from cppeditor to cpptools

Have the mimetypes and their registration in the same plugin
as their constants.

Change-Id: I350ab4eb0da3941ca9282ff98d8d0e158b568ef3
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/cpptools/cpptoolsplugin.cpp

@@ -140,6 +140,8 @@ bool CppToolsPlugin::initialize(const QStringList &arguments, QString *error)
     Q_UNUSED(arguments)
     Q_UNUSED(error)
 
+    Utils::MimeDatabase::addMimeTypes(QLatin1String(":/cpptools/CppTools.mimetypes.xml"));
+
     CppModelManager::instance()->setParent(this);
 
     m_settings = new CppToolsSettings(this); // force registration of cpp tools settings