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/subversion/subversionplugin.cpp

@@ -56,7 +56,6 @@
 #include <utils/algorithm.h>
 #include <utils/fileutils.h>
 #include <utils/hostosinfo.h>
-#include <utils/mimetypes/mimedatabase.h>
 #include <utils/parameteraction.h>
 #include <utils/qtcassert.h>
 #include <utils/synchronousprocess.h>
@@ -215,8 +214,6 @@ bool SubversionPlugin::initialize(const QStringList & /*arguments */, QString *e
 
     m_subversionPluginInstance = this;
 
-    Utils::MimeDatabase::addMimeTypes(QLatin1String(":/trolltech.subversion/Subversion.mimetypes.xml"));
-
     m_client = new SubversionClient;
 
     addAutoReleasedObject(new SettingsPage(versionControl()));