VcsManager: Register IVersionControls with VcsManager

Get some more objects out of the pool.

Change-Id: Id93021b712307c4777dc39b9d15aa18a46318885
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/subversion/subversionplugin.cpp

@@ -210,7 +210,7 @@ bool SubversionPlugin::initialize(const QStringList & /*arguments */, QString *e
 
     Context context(SUBVERSION_CONTEXT);
 
-    initializeVcs(new SubversionControl(this), context);
+    initializeVcs<SubversionControl>(context, this);
 
     m_subversionPluginInstance = this;