move new_playlist Lua script from mixbus and add some garbage collection

scripts/new_playlist.lua

@@ -0,0 +1,17 @@
+ardour {
+	["type"]    = "EditorAction",
+	name        = "New Playlist",
+	license     = "MIT",
+	author      = "Ardour Lua Taskforce",
+	description = [[Prompts and builds a new playlist for every track in the session.]]
+}
+
+function factory () return function ()
+
+	for r in Session:get_tracks():iter() do
+		local rtav = Editor:rtav_from_route(r) -- lookup RTAV
+		Editor:new_playlists(rtav:to_timeaxisview())
+	end
+
+collectgarbage()
+end end

scripts/reset_mixer.lua

@@ -82,4 +82,5 @@ function factory() return function()
 		end
 	end
 	::end_script::
+	collectgarbage()
 end end

scripts/store_recall_mixer.lua

@@ -403,5 +403,5 @@ function factory() return function()
 			end
 		end
 	end
-
+collectgarbage()
 end end

scripts/track_organizer.lua

@@ -101,6 +101,6 @@ function factory () return function ()
            end
        end
    end
-
 	::script_end::
+	collectgarbage()
 end end