Move mimetype definitions to plugin specs

- Avoids the hassle of QRC files and manually registering mime types
- Avoids performance regressions because of mime types that are
  registered after mime database has been used
- Makes it technically possible to detect that a disabled plugin could
  handle a mime type if it was enabled

Change-Id: I373008b1b56e9c6b4853055f20b3eeb112a6eff9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cvs/cvsplugin.cpp

@@ -56,7 +56,6 @@
 #include <coreplugin/locator/commandlocator.h>
 #include <coreplugin/vcsmanager.h>
 #include <utils/fileutils.h>
-#include <utils/mimetypes/mimedatabase.h>
 #include <utils/stringutils.h>
 
 #include <QDebug>
@@ -203,8 +202,6 @@ bool CvsPlugin::initialize(const QStringList &arguments, QString *errorMessage)
 
     m_cvsPluginInstance = this;
 
-    Utils::MimeDatabase::addMimeTypes(QLatin1String(":/trolltech.cvs/CVS.mimetypes.xml"));
-
     m_client = new CvsClient;
 
     addAutoReleasedObject(new SettingsPage(versionControl()));