Adding Save Import & Export (Demo v0.1.3)

Version 0.1.3 of the demo is uploaded! This one is pretty small, but should make things easier down the line: 

• A handful of small style fixes and behind-the-scenes cleanup
• New import and export save file features (found in the settings tab)

With the import and export, players can download their save data as a .txt file, or upload a .txt save file to overwrite their current in-progress game save. Down the line, this will make it so players can move their saves from one platform to another (the browser-based demo to a desktop or mobile-based full version, for example). It was also make it much easier for me to debug any logic problems that players (and beta testers, when we get there) run into, because they'll be able to export and send me their exact game state.

And I guess people could edit their save files and cheat, but who cares? I don't make the rules here.