Fauna & Orchestra

I wanted to fix a few bugs and add the achievement tree while I keep working on v1.1.0! Let's say it has more content than I had planned :)

Added:

• Fauna & Orchestra achievement tree! There's just one for the time being, but more will come with v1.1.0!

Fixed:

• Musicians now only start to play the instrument when the music starts.
• The frog stops conducting if you take the musicians with the briefcase.

Acknowledged:

• The penguin sound may be too loud and seems to be heard further than it should. I've not found the issue yet but I'll keep looking.