add/update lua scripts

scripts/s_replaceplugin.lua

@@ -0,0 +1,11 @@
+ardour { ["type"] = "Snippet", name = "Replace Plugin" }
+
+function factory () return function ()
+
+	route = Session:route_by_remote_id(1)
+	old = route:nth_plugin(0)
+	new = ARDOUR.LuaAPI.new_plugin(Session, "http://gareus.org/oss/lv2/fil4#stereo", ARDOUR.PluginType.LV2, "");
+	route:replace_processor (old, new, nil)
+	old = nil new = nil -- explicitly drop references (unless they're local vars)
+
+end end