-Added buttons for saving and loading the game

Save file extension is ".isc043" This will change every new release and the previous files will probably not be compatible with the new releases of the game.

I did not make a HTML5 version of this release because saving would not work. I'm planning on not updating the HTML5 version at all anymore because the new features I'm thinking about adding won't be compatible with it as well.

In the future I'll make a release specifically for HTML5 that won't have some features.