Môsi 1.0 released

So many changes:

• better random world generation
• improved UI, now with more icons
• palette color picker is now in grid form
• music!
• an overhauled script system

All the major features I wanted to add are in, so I'm calling this the big 1.0 release. But that doesn't mean there's not more to come! Planned features for future releases include:

• friendlier script editing
• bring back message-passing in scripts (but better!)

Find any issues? Github is a good place to tell me about a bug.