1.1 savegame changes

so i've added multi-slot saves to the 1.1 patch! this is something i was initially kind of hesitant to do, just due to the risk of messing something up with the conversion process and accidentally deleting everybody's saves. so, before i finish the 1.1 patch (which still has a ways to go) i want to test with a wide variety of saves to make sure i'm not gonna miss some rarely-reached configuration of information and obliterate some people's savedata.

so anybody interested should either paste their save export here, or in some temporary pastebin thing and link it here. right now with where the code is at, it should all be fine save for the occasional display glitch, but this is a situation where i'd rather be safe than sorry.