Fix most of the warnings in the Visual Studio build

- Fix energy-draining weapons
- Specials called when a spell is targeted on a space now work a little differently if the spell is multi-target. For each target, the special is triggered if it exists; otherwise the normal spell behaviour occurs.

src/tools/fileio_scen.cpp

@@ -467,7 +467,7 @@ static void readShopFromXml(ticpp::Element& data, cShop& shop, cScenario& scen)
 			shop.setPrompt(boost::lexical_cast<eShopPrompt>(val));
 		} else if(type == "face") {
 			pic_num_t face;
-			elem->GetText(face);
+			elem->GetText(&face);
 			shop.setFace(face);
 		} else if(type == "entries") {
 			int entries_found = 0;