Finish and polish new_game.c

Only one function is left undocumented. I tried to go into the assembly
to at least name it, but it clears fields in the save block that aren't
even documented yet.

src/easy_chat.c

@@ -359,7 +359,7 @@ void easy_chat_input_maybe(void)
         words = gSaveBlock2Ptr->apprentices[0].easyChatWords;
         break;
     case 20:
-        words = sub_801B058();
+        words = GetSaveBlock1Field3564();
         break;
     default:
         return;