Add method to reset plugin statsistics

libs/ardour/ardour/plugin_manager.h

@@ -74,6 +74,7 @@ public:
 	bool cancelled () { return _cancel_scan; }
 	bool no_timeout () { return _cancel_timeout; }
 
+	void reset_stats ();
 	void stats_use_plugin (PluginInfoPtr const&);
 	bool stats (PluginInfoPtr const&, int64_t& lru, uint64_t& use_count) const;
 	void save_stats ();

libs/ardour/plugin_manager.cc

@@ -1673,6 +1673,14 @@ PluginManager::load_stats ()
 	}
 }
 
+void
+PluginManager::reset_stats ()
+{
+	statistics.clear ();
+	PluginStatsChanged (); /* EMIT SIGNAL */
+	save_stats ();
+}
+
 void
 PluginManager::stats_use_plugin (PluginInfoPtr const& pip)
 {