Fixed some type conversion warnings in VC. Mostly float <-> int and bool <-> int.

src/modules/event/sdl/Event.cpp

@@ -99,7 +99,7 @@ namespace sdl
 		case SDL_ACTIVEEVENT:
 			if (e.active.state & SDL_APPINPUTFOCUS) {
 				m.type = Event::TYPE_FOCUS;
-				m.focus.f = e.active.gain;
+				m.focus.f = (e.active.gain != 0);
 				return true;
 			} else break;
 		case SDL_QUIT:

src/modules/event/sdl/wrap_Event.cpp

@@ -65,7 +65,7 @@ namespace sdl
 			msg.joystick.button = luaL_checkint(L, 3);
 			return true;
 		case Event::TYPE_FOCUS:
-			msg.focus.f = lua_toboolean(L, 2);
+			msg.focus.f = luax_toboolean(L, 2);
 			return true;
 		case Event::TYPE_QUIT:
 			return true;