Plugin::Descriptor: renamed sub_plugin_features to subPluginFeatures

Renamed field sub_plugin_features to subPluginFeatures in
Plugin::Descriptor struct.
(cherry picked from commit e8c3c21f7f)

include/Plugin.h

@@ -137,7 +137,7 @@ public:
 			const Plugin::PluginTypes m_type;
 		} ;
 
-		SubPluginFeatures * sub_plugin_features;
+		SubPluginFeatures * subPluginFeatures;
 
 	} ;