Some test cases for saving scenarios, and fix some bugs they revealed

- Fix variable town entry and saved item rects not being saved if they referenced an invalid town
- Fix "blank" scenario timers being saved
- Fix junk data appearing in timers
- Output operators for location and rectangle types
- Set timer node_type to 2 when loading from town record

src/scenedit/scen.main.cpp

@@ -37,6 +37,7 @@ short mode_count = 0;
 cOutdoors* current_terrain;
 short pixel_depth,old_depth = 8;
 
+std::string scenario_temp_dir_name = "ed_scenario";
 bool change_made = false, ae_loading = false;
 
 // Numbers of current areas being edited