Merge pull request #519 from NQNStudios:sounds

* Changed shop purchase sound effects where Yum! definitely didn't fit. For alchemy, mage spells, and priest spells, I made the sound the same as the sound when you perform those actions. I figure this actually makes sense because the teacher would show you how to do the thing.
* For skill training, I made the sound be the same as leveling up. I think this makes sense.
* When something is too heavy to pick up, the "Argh!" labeled as 'Action Failure' in the editor sound picker makes a lot of sense--you tried to pick it up and were frustrated.
* I changed beep() so every platform just plays sound effect 1, the one labeled "low beep" [here](http://openboe.com/docs/editor/appendix/Sounds.html) that's labeled "Cancel target lock" in the editor picker. I think this reasonable.
* Removed `ding()` which was an unused alias for `beep()`

src/game/boe.items.cpp

@@ -499,7 +499,7 @@ static bool display_item_event_filter(cDialog& me, std::string id, size_t& first
 			set_item_flag(&item);
 		} else {
 			if(!allow_overload && item.item_weight() > univ.party[current_getting_pc].free_weight()) {
-				beep(); // TODO: This is a game event, so it should have a game sound, not a system alert.
+				play_sound(41);
 				me["prompt"].setText("It's too heavy to carry.");
 				give_help(38,0,me);
 				return true;