Numerous changes to terrain and trim. The changes to the scneario editor work as expected.

- New way of drawing walkway (doesn't work yet)
- New way of drawing roads (doesn't yet work correctly)
- New way of drawing trim (not tested yet)
- New way of handling marked specials (works in editor but not in game)
- New way of handling two-space rubble in the editor (works as expected)
- Merged several terrain special properties
- Deprecated several terrain graphics
- Completed (probably) the import & convert code for old-format terrain
- Probably other things that I have forgotten that have something to do with terrain
- A few other little things, bugfixes, etc

git-svn-id: http://openexile.googlecode.com/svn/trunk@56 4ebdad44-0ea0-11de-aab3-ff745001d230

osx/classes/scenario.cpp

@@ -72,7 +72,10 @@ cScenario& cScenario::operator = (legacy::scenario_data_type& old){
 	for(i = 0; i < 30; i++) boats[i] = old.scen_boats[i];
 	for(i = 0; i < 30; i++) horses[i] = old.scen_horses[i];
 	flag_g = old.flag_g;
-	for(i = 0; i < 256; i++) ter_types[i] = old.ter_types[i];
+	for(i = 0; i < 256; i++){
+		ter_types[i].i = i;
+		ter_types[i] = old.ter_types[i];
+	}
 	for(i = 0; i < 20; i++) scenario_timer_times[i] = old.scenario_timer_times[i];
 	for(i = 0; i < 20; i++) scenario_timer_specs[i] = old.scenario_timer_specs[i];
 	flag_h = old.flag_h;