Stop storing players as bare pointers - use unique_ptr instead

Should fix some potential memory leaks that were caught by static analysis

src/pcedit/pc.editors.cpp

@@ -166,6 +166,7 @@ static bool pick_race_select_led(cDialog& me, std::string item_hit, bool, const
 			case 1: race = eRace::NEPHIL; break;
 			case 2: race = eRace::SLITH; break;
 			case 3: race = eRace::VAHNATAI; break;
+			default: return false;
 		}
 		if(store_trait_mode == 0)
 			pc->race = race;